黄骅坳陷三马地区中-深部储层成岩作用及主控因素分析

黄骅坳陷三马地区储集岩样品的显微特征及成岩矿物的组合关系分析结果表明，三马地区下第三系中深层储层主要处于晚成岩A期，成岩现象包括石英、长石的次生加大、碳酸盐矿物胶结作用、矿物交代作用、溶解作用和粘土矿物转化作用等。其中石英次生加大于2700m左右开始出现，随埋深增大，石英增生加强；长石次生加大现象不十分普遍；碳酸盐胶结作用包括早期自生泥晶方解石胶结作用、连晶方解石和晚期白云石(或铁方解石)的胶结作用。在扫描电镜下可见到方解石与含铁方解石集合体充填在粒间孔隙中或与石英、钠长石及粘土矿物共生，白云岩多呈菱形粒状分布于粒间；常见的交代现象主要有方解石交代长石、石英及粘土矿物，粘土矿物交代长石、石英等；溶解作用主要有长石的溶解、碳酸盐颗粒的溶解和方解石胶结物的溶解等，粘土矿物的转化主要为蒙脱石、高岭石向伊利石(或绿泥石)转化。还讨论了储层岩相、岩性特征、孔隙水中有机酸含量、早期方解石的充填、烃类早期注入等因素对储层成岩演化的控制作用。     

鄂尔多斯盆地古隆起东北侧马五41储层膏模孔类型及充填过程分析

利用岩芯和薄片资料,通过薄片孔隙描述、铸体薄片图像分析等方法,在对研究区马五₄1储层孔隙类型划分的基础上,详细划分了膏模孔充填类型,并对其充填过程进行了阐述。研究结果表明,研究区马五₄1储层主要发育溶蚀孔（膏模孔和其他溶孔）、晶间孔、晶间溶孔、微裂缝4种类型的孔隙,且以膏模孔为主。通过镜下薄片对膏模孔内不同充填物观察发现,充填物主要为白云石、方解石、硬石膏,其中半充填的膏模孔中主要充填物为白云岩粉砂、白云岩粉砂+石英、白云岩粉砂+铁白云石3种类型,而全充填的膏模孔中主要充填物为白云岩粉砂+方解石、白云岩粉砂+石英+方解石、白云岩粉砂+硬石膏3种类型。综合分析认为膏模孔是含膏云岩中石膏等易溶晶体溶蚀后,晶体轮廓保留而形成的,首先裸露风化壳期先充填白云岩粉砂和深灰色方解石,其次深埋藏期充填自生石英、白色亮晶方解石、铁白云石及硬石膏。     

The early diagenetic origin of Lower Carboniferous mottled limestones (pseudobreccias)

Dark mottles are a prominent and widespread feature of the regressive, cyclic, shallow marine limestones which form the late Asbian succession in many parts of Britain. The colour difference which defines mottles in outcrop is caused by distinct but often subtle petrographic differences in the limestone fabric. Specifically, mottles contain a light brown coloured opaque inclusion-rich calcite spar with characteristic dull brown luminescence; ‘mottle spar’. Outside mottle margins this calcite spar is absent, with clear inequant blocky cements forming the pore filling phase. ‘Mottle spar’ comprises a fabric of irregular crystals predominantly 5–40 μm in diameter, with more regular crystals up to 100 μm diameter often occurring in intraparticle and large interparticle pores. Under cathodoluminescence, ‘mottle spar’ displays crystal morphologies and growth patterns which indicate that both localized neomorphism and patchy cementation contributed to mottle formation. Cathodoluminescence cement stratigraphy shows that ‘mottle spar’ pre-dates all other major pore filling cements in the local Asbian succession, but post-dates marine micritization. ‘Mottle spar’ sharply defines the moulds of former aragonitic allochems which are now filled by the later clear, inequant spar cements. This shows that aragonite dissolution occurred after the formation of ‘mottle spar’. Mottles in calcretes contain unaltered allochems which have been protected from the effects of subaerial micritization by ‘mottle spar’, although mottles are often affected by subaerial brecciation. This evidence shows that mottles formed during early diagenesis; after marine micritization, but before dissolution of aragonite, subaerial exposure and meteoritic phreatic cementation. Mottles represented lithified patches of very low porosity which are interpreted to have formed in the marine/freshwater mixing zone, during the repeated phases of regression and emergence in the late Asbian.     

Diagenesis and Evolution of the Holocene Coquinite from the Haishan Island,Eastern Guangdong,China

The coastal hard rock with a thickness of over 5 m and a distribution area of nearly 200 ha in the Haishan Island,south China,has long drawn researchers' attention.However,there were controversies over its formation and classification,and these controversies in turn lead to the dispute of sea level changes and coastal uplift-subsidence of this area.To investigate its diagenesis and evolution,petrographic analysis,elemental geochemistry,isotopic analysis,and radiocarbon dating were used in the present stu...     

Diagenesis and Evolution of the Holocene Coquinite from the Haishan Island,Eastern Guangdong,China

The coastal hard rock with a thickness of over 5 m and a distribution area of nearly 200 ha in the Haishan Island, south China, has long drawn researchers’ attention. However, there were controversies over its formation and classification, and these controversies in turn lead to the dispute of sea level changes and coastal uplift-subsidence of this area. To investigate its diagenesis and evolution, petrographic analysis, elemental geochemistry, isotopic analysis, and radiocarbon dating were used in the present study. Radiocarbon dating indicates that the deposition of the Haishan Coquinite commenced in the mid Holocene and lasted to ~600 a B.P. Petrographic analysis shows that the Haishan Coquinite is cemented by low-Mg calcite, indicating that the cementation occurred in a meteoric environment. The elemental geochemistry and isotopic values demonstrate that the coquinite suffered strong leaching, which was thought to be responsible for the meteoric cementation of the coquinite. According to these results, the diagenesis of the coquinite is revealed: deposition of the Haishan Coquinite commenced in the mid Holocene in a shoal environment, initial cementation occurred and cement may be high-Mg calcite or aragonite; latterly the coquinite exposed to meteoric environment as a result of lowering of relative sea level, and the cement altered to low-Mg, which took the morphologies of bladed calcite rim and equant spar. A four-stage evolution model is proposed: (1) deposition stage, (2) initial cementation, (3) exposure to and cementation in meteoric environment, and (4) erosion stage. The published reports indicate that the hard rock should be designated as coquinite. Based on these studies, mid-Holocene sea level in this area was discussed, and the Haishan Island was proposed to uplift with a rate of ~5 mm/a in the last ~600 a.     

Diagenesis in the Middle Jurassic Khatatba Formation sandstones in the Shoushan Basin,northern Western Desert,Egypt

The Middle Jurassic Khatatba Formation acts as a hydrocarbon reservoir in the subsurface in the Western Desert, Egypt. This study, which is based on core samples from two exploration boreholes, describes the lithological and diagenetic characteristics of the Khatatba Formation sandstones. The sandstones are fine‐ to coarse‐grained, moderately to well‐sorted quartz arenites, deposited in fluvial channels and in a shallow‐marine setting. Diagenetic components include mechanical and chemical compaction, cementation (calcite, clay minerals, quartz overgrowths, and a minor amount of pyrite), and dissolution of calcite cements and feldspar grains. The widespread occurrence of an early calcite cement suggests that the Khatatba sandstones lost a significant amount of primary porosity at an early stage of its diagenetic history. In addition to calcite, several different cements including kaolinite and syntaxial quartz overgrowth occur as pore‐filling and pore‐lining cements. Kaolinite (largely vermicular) fills pore spaces and causes reduction in the permeability of the reservoir. Based on framework grain–cement relationships, precipitation of the early calcite cement was either accompanied by or followed the development of part of the pore‐lining and pore‐filling cements. Secondary porosity development occurred due to partial to complete dissolution of early calcite cements and feldspar. Late kaolinite clay cement occurs due to dissolved feldspar and has an impact on the reservoir quality of the Khatatba sandstones. Open hydraulic fractures also generated significant secondary porosity in sandstone reservoirs, where both fractures and dissolution took place in multiple phases during late diagenetic stages. The diagenesis and sedimentary facies help control the reservoir quality of the Khatatba sandstones. Fluvial channel sandstones have the highest porosities and permeabilities, in part because of calcite cementation, which inhibited authigenic clays or was later dissolved, creating intergranular secondary porosity. Fluvial crevasse‐splay and marine sandstones have the lowest reservoir quality because of an abundance of depositional kaolinite matrix and pervasive, shallow‐burial calcite and quartz overgrowth cements, respectively. Copyright © 2013 John Wiley & Sons, Ltd.     

川中安岳构造寒武系龙王庙组油气成藏史

本文从岩芯和薄片观察入手,利用阴极发光分析、流体包裹体分析、激光拉曼分析、充填物的稳定同位素分析、磷灰石裂变径迹年代学分析等技术手段,确定了龙王庙组储层的胶结充填序列、油气成藏历史。龙王庙组储层中可以识别出7个期次的胶结充填序列:海底环境纤维状白云石胶结→浅埋藏环境粒状白云石胶结→表生成岩环境渗流粉砂白云石充填→再次浅埋藏-中埋藏环境白云石充填→深埋藏环境白云石充填→深埋藏环境方解石充填→抬升埋藏环境石英充填,通过所识别出的胶结充填物的流体包裹体特征以及和沥青之间的关系,认为龙王庙组存在至少5期油气成藏。第Ⅳ期白云石-第Ⅶ期石英中捕获的流体包裹体的相态也从液烃包裹体→气液两相烃类包裹体→气相烃类包裹体演化,反映了龙王庙组经历了古油藏形成、古油藏破坏、再次形成古油藏、油裂解为天然气、古气藏形成和喜马拉雅期构造隆升期气藏调整定型的过程;磷灰石裂变径迹分析表明,安岳构造喜马拉雅期的隆升幅度约1865~2030m,为龙王庙组气藏的调整和定型期,这一成藏事件被晚期充填的第Ⅶ期石英所记录。龙王庙组储层中第Ⅳ期白云石充填物的87Sr/86Sr、δ13C、δ18O同位素比值反映了该期白云石与围岩基质的重溶沉淀有关,且是在相对温度较高的埋藏条件下沉淀的。晚期孔洞缝中充填石英的87Sr/86Sr、δ30Si、δ18O同位素表明其主要源于含硅质的成岩流体,与深部幔源热液流体活动无关,龙王庙组油气成藏过程中未见外来破坏性流体的参与。     

Shallow-marine carbonate cementation in Holocene segments of the calcifying green alga Halimeda

Early-diagenetic cementation of tropical carbonates results from the combination of numerous physico-chemical and biological processes. In the marine phreatic environment it represents an essential mechanism for the development and stabilization of carbonate platforms. However, diagenetic cements that developed early in the marine phreatic environment are likely to become obliterated during later stages of meteoric or burial diagenesis. When lithified sediment samples are studied, this complicates the recognition of processes involved in early cementation, and their geological implications. In this contribution, a petrographic microfacies analysis of Holocene Halimeda segments collected on a coral island in the Spermonde Archipelago, Indonesia, is presented. Through electron microscopical analyses of polished samples, this study shows that segments are characterized by intragranular cementation of fibrous aragonite, equant High-Mg calcite (3.9 to 7.2 Mol% Mg), bladed Low-Mg calcite (0.4 to 1.0 Mol% Mg) and mini-micritic Low-Mg calcite (3.2 to 3.3 Mol% Mg). The co-existence and consecutive development of fibrous aragonite and equant High-Mg calcite results initially from the flow of oversaturated seawater along the aragonite template of the Halimeda skeleton, followed by an adjustment of cement mineralogy towards High-Mg calcite as a result of reduced permeability and fluid flow rates in the pores. Growth of bladed Low-Mg calcite cements on top of etched substrates of equant High-Mg calcite is explained by shifts in pore water pH and alkalinity through microbial sulphate reduction. Microbial activity appears to be the main trigger for the precipitation of mini-micritic Low-Mg calcite as well, based on the presumable detection of an extracellular polymeric matrix during an early stage of mini-micrite Low-Mg calcite cement precipitation. Radiocarbon analyses of five Halimeda segments furthermore indicate that virtually complete intragranular cementation in the marine phreatic environment with thermodynamically/kinetically controlled aragonite and High-Mg calcite takes place in about 100 years. Collectively, this study shows that early-diagenetic cements are highly diverse and provides new quantitative constraints on the rate of diagenetic cementation in tropical carbonate factories.     

西沙群岛西科1井第四纪生物礁中典型暴露面的岩石学与孔隙特征

根据岩心观察、薄片鉴定和图像分析, 对西科1井第四纪发育的典型暴露面及其附近的岩石类型、成岩作用和孔隙类型进行了系统的分析.研究表明: 典型暴露面(埋深68.75~70.24 m)附近的岩石类型为骨架灰岩和泥粒灰岩, 成岩作用类型包括溶解作用、胶结作用、泥晶化作用和新生变形作用, 孔隙类型主要为粒间孔和粒间溶孔、粒内孔及粒内溶孔、生长骨架孔及其溶孔、铸模孔和晶间溶孔.碳酸盐矿物的悬垂状产状、生物体腔孔充填物的方解石化和普遍发育的溶解作用指示该深度段遭受了大气水淋滤的强烈改造.      

基于星点状方解石胶结与溶解的识别查明砂岩粒间孔隙类型——以雅布赖盆地新河组砂岩为例

目前含油气砂岩中粒间孔隙是原生孔隙还是次生孔隙的认识仍不一致,而对星点状方解石胶结与溶解的识别能够有效地查明粒间孔隙的类型。文章通过铸体薄片细致地观察雅布赖盆地新河组砂岩中的微观现象,以成岩环境演化和成岩序列分析为主线,重视方解石胶结物的赋存状态与物质来源和溶蚀流体来源的配置关系,精细解剖微观现象,从而弄清楚星点状方解石的成因,进而查明砂岩的粒间孔隙类型和储集空间类型。结果表明,粒间孔隙中的星点状方解石是成岩早期浸染状方解石胶结物的溶蚀残余,溶蚀流体为成岩中期的有机酸流体,溶蚀类型为一致性溶解,形成的粒间孔隙为次生孔隙。鉴于此,雅布赖盆地新河组砂岩的储集空间由次生粒间孔隙和次生粒内孔隙（长石、岩屑、方解石胶结物的溶蚀孔隙）组成。      

Diagenesis and reservoir quality analysis in the Lower Cretaceous Qishn sandstones from Masila oilfields in the Sayun–Masila Basin,eastern Yemen

Lower Cretaceous sandstones of the Qishn Formation have been studied by integrating sedimentological, petrological and petrophysical analyses from wells in the Masila oilfields of eastern Yemen. These analyses were used to define the origin, type of diagenesis and its relation to reservoir quality. The sandstones of the Qishn Formation are predominately quartz arenite to subarkose arenite with sublitharenite and quartz wackes displaying a range of porosities, averaging 22.33%. Permeability is likewise variable with an average of 2844.2 mD. Cementation coupled with compaction had an important effect on porosity destruction after sedimentation and burial. The widespread occurrence of early calcite cement suggests that the sandstones of the Qishn Formation lost significant primary porosity at an early stage of its diagenetic history. In addition to poikilotopic calcite, several different cements including kaolinite, illite, chlorite and minor illite–smectite occur as pore‐filling and pore‐lining cements, which were either accompanied by or followed the development of the early calcite cement. Secondary porosity development occurred due to partial to complete dissolution of early calcite cements and feldspar grains. The new data presented in this paper suggest the reservoir quality of Qishn sandstones is strongly linked to their diagenetic history; hence, the reservoir quality is reduced by clay minerals, calcite and silica cements but is enhanced by the dissolution of the unstable grains, in addition to partial or complete dissolution of calcite cements and unstable grains. Copyright © 2015 John Wiley & Sons, Ltd.     

海南岛全新世海滩岩的胶结作用与成岩环境的关系

我国海南岛及南海诸岛沿岸,广泛发育海滩岩。1980年我队赴海南岛考察现代沉积时,对海滩岩的分布、岩性特征及其与周围环境的关系进行了观察和采样。样品采自崖县鹿回头三亚湾水尾岭海蚀崖、西洲岛、小东海、东瑁岛、西瑁岛、天涯海角,乐东县莺歌海,文昌县渔业等地(图1)。有关的地质、地貌及岩性特征等,已有许多描述,对海滩岩的岩石学及成岩作用也有许多研究。本文侧重探讨海滩岩的胶结作用及与成岩环境的关系。     

江汉盆地白垩系渔洋组砂岩的成岩作用及其热力学分析

江汉盆地白垩系渔洋组砂岩存在五种类型的成岩作用。其中,与油气运移有关并对储层孔隙演化产生重要影响的是硬石膏的胶结与交代作用和后期方解石再次胶结作用。为了更好的研究成岩作用发生的控制因素以及成岩环境的变化,我们通过细致的热力学推导,绘制出包含方解石、白云石和硬石膏等矿物相在内的五组分相图。通过相图分析可以看出,pH 值在成岩作用过程中有着重要的作用。方解石和白云石的胶结及交代作用代表了偏中性或碱性的成岩环境;而硬石膏的胶结及交代作用则表明成岩环境由中性或碱性向酸性转变,例如酸性的油气前锋流体的注入。另外,成岩环境中阳离子(Ca~(2 )、Mg~(2 ))和阴离子(CO_3~(2-)、SO_4~(2-))的浓度对方解石、白云石和硬石膏的胶结、溶解及交代作用也有重要影响。     

歧口凹陷沙河街组火山岩成岩作用及对储集性能的控制

根据岩心观察资料,利用偏光显微镜、扫描电镜等对歧口凹陷沙河街组火山岩的成岩作用进行了详细地研究,把成岩作用类型分为早期和晚期两个阶段、13种成岩作用类型。根据成岩作用阶段划分依据,结合盆地埋藏-热演化史和烃类充注史等资料,将歧口凹陷沙河街组火成岩成岩作用阶段划分为早期和晚期两个阶段。火成岩共发生了3期溶蚀作用、2期构造作用、2期油气充注作用,以及绿泥石、硅质、碳酸盐等胶结作用。主要成岩序列为溶蚀作用Ⅰ→构造作用Ⅰ→栉壳状绿泥石→细纤维状绿泥石→硅质Ⅰ→较粗纤维状绿泥石→烃类充注Ⅰ→硅质充填Ⅱ→亮晶方解石Ⅰ→构造作用Ⅱ→溶蚀作用Ⅱ→烃类充注Ⅱ→亮晶方解石Ⅱ→铁方解石→硅质充填Ⅲ→溶蚀作用Ⅲ。成岩作用对储集性能的控制具有改善和破坏的双重作用,对储集性能具有改善作用的成岩作用类型有挥发分逸出作用、熔蚀作用、冷凝收缩作用、脱玻化作用、机械压实破裂作用、风化淋滤溶蚀作用、次生溶蚀作用。对储集性能具有破坏作用的成岩作用类型有熔结作用、充填作用、机械压实压溶作用、胶结作用。     

四川盆地西南部震旦系白云岩成岩过程中的孔隙演化

我国南方,特别是西南地区震旦系白云岩具有良好的油气储集潜力。四川盆地西南部震旦系白云岩储层多集中分布在灯影组的中、上部,储集空间以次生成因的孔、洞、缝为主。这些孔隙的形成与演化受多种因素的影响,其中成岩作用的控制明显,压实作用和多期白云岩的胶结作用使原生孔隙基本消失,而重结晶作用和溶解作用促进了次生孔隙的形成,但多期白云石和硅质的充填作用又导致次生孔隙缩小,局部消失。总之,震旦系白云岩储层内的孔隙是在长达六亿年左右的地质历史中,由各种成岩作用及其它因素相互影响下的最终产物。     

鄂尔多斯盆地苏77、召51区块山23段储层成岩作用与孔隙演化定量分析

利用扫描电镜、岩石薄片、高压压汞、X衍射等实验及物性分析资料,对鄂尔多斯盆地苏77、召51区块山23段储层基本特征、成岩作用类型及强度、孔隙演化模式进行研究。结果表明：储层主要岩石类型为成分成熟度较高、结构成熟度较低的石英砂岩和岩屑石英砂岩;孔隙类型以溶孔为主,残余粒间孔和晶间孔含量次之。储层在经历中等-强程度的压实,中等程度的胶结以及强烈的溶蚀作用后,处于中成岩阶段B期,局部处于晚成岩阶段。压实作用和胶结作用导致原生孔隙遭到破坏,孔隙度损失分别为1694％和1429％,晶间孔和溶蚀作用分别使孔隙度增加092％和564％,储层物性得以改善。孔隙空间经历原生孔隙减少→次生孔隙发育→次生孔隙减少→混合孔隙并存的复杂演化过程。     

二连盆地额仁淖尔凹陷下白垩统湖相云质岩优质储层特征及控制因素

二连盆地多个凹陷的下白垩统均发育一套湖相白云岩.它不仅是一个重要的地层对比标志层,还是一套有效的储集层.这套储层孔隙结构复杂,非均质性强.寻找优质储层是油气勘探的关键.研究以二连额仁淖尔凹陷的下白垩统湖相云质岩为研究对象,研究了云质岩储层的储层特征和成因.本次研究采用岩心观察、岩石学、扫描电镜(SEM)、X射线衍射、稳...     

生物碎屑灰岩差异成岩及储集层特征:以伊拉克HF油田白垩系Mishirif组为例*

中东地区白垩系Mishirif组以生物碎屑灰岩为主,其形成于温暖潮湿的环境中。综合利用岩心、铸体薄片、全岩分析、常规物性及高压压汞等资料,以伊拉克HF油田Mishrif组为例,开展生物碎屑类型、分布特征、差异成岩及储集层特征等研究。Mishrif组灰岩中生物碎屑以底栖有孔虫、非固着类双壳类、厚壳蛤和棘皮动物为主,含少量苔藓动物、藻类与海绵动物,其含量、类型及大小对沉积环境有重要指示意义。沉积环境决定岩石组分与结构的差异,在此基础上成岩作用控制岩石的孔隙结构与物性特征。生物碎屑主要经历了不同程度海水环境的泥晶化和生物钻孔、大气淡水环境的溶蚀和胶结、埋藏环境的压实压溶和颗粒破裂作用。以底栖有孔虫和非固着类双壳类碎屑为主的低能沉积环境具有“弱溶蚀、强胶结、强压实”的成岩特征,主要发育微孔、晶间孔及粒内孔,孔喉分布呈偏细态细微喉单峰型,物性较差;以厚壳蛤和棘皮动物碎屑为主的高能沉积环境具有“强溶蚀、弱胶结”的成岩特征,主要发育铸模孔、粒间孔及粒间溶孔,孔喉分布呈偏粗态中粗喉极宽峰型,是Mishrif组最有利储集层。以HF油田Mishrif组为代表的白垩系生物碎屑灰岩在中东地区发育广泛,故上述成果对于该地区生物碎屑灰岩油气开发具有重要意义。     

Calcite from the Quaternary spring waters at Tylicz, Krynica, Polish Carpathians

At Tylicz, near Krynica Spa (Polish Carpathians), spelean deposits fill fissures and caverns in Eocene flysch rocks. They occur as: (1) clastic cave sediments transformed into hard crusts due to cementation by finely crystalline low-Mg calcite, (2) drusy calcite that covers crust surfaces and fills voids in the crust and (3) colloform calcite. Two varieties of drusy calcite are distinguished: acicular and columnar. The acicular calcite is built up of crystallites forming spherulitic fans or cones. In places it is syntaxially covered with colloform calcite. The drusy calcite is low-Mg ferroan calcite with non-ferroan subzones, whereas the colloform calcite is a low-Mg non-ferroan variety. The columnar calcite crystals form fan-like bundles. Cross-sections cut perpendicular to the c-axes of columnar crystals are equilateral triangular in shape, although some have slightly curved edges. The columnar crystals have steep rhombic terminations and most have curved triangular faces, i.e. gothic-arch calcite. Saddle crystals have also been observed. The columnar crystals are composed of radially orientated crystallites whose long dimension is parallel to the c-axis. The curved crystal faces of such polycrystals are interpreted as a result of differential growth rates of the crystallites. The spelean calcites precipitated from CO₂-saturated water. The high rate of CaCO₃ precipitation is thought to be responsible for the formation of radial structures. Finely crystalline calcite formed within pore spaces of clastic sediments close to the water-air interface, drusy calcite crystallized beneath the water-air interface, and colloform calcite precipitated from thin films of water.     

济阳坳陷古近系成岩作用及其对储层质量的影响?

大量的储层分析化验资料研究表明，济阳坳陷古近系砂岩储层经历了压实、胶结等多种成岩作用。压实作用以机械压实为主，压溶作用较少。胶结作用主要有十分普遍的石英次生加大胶结、碳酸盐胶结、粘土矿物胶结。碳酸盐胶结物有早、晚两期，早期泥晶方解石主要分布在浅层，连晶方解石充填的深度分布范围大，中深部最为发育。溶蚀作用主要有碳酸盐胶结物、长石颗粒和少量岩屑溶蚀。储层孔隙经历了由原生到次生的演化过程，在成岩演化过程中，长石的溶蚀作用、碳酸盐矿物的沉淀与溶解作用是影响孔隙大小的关键因素，早期方解石的胶结有利于后期次生孔隙的发育。不同凹陷次生孔隙发育的深度不同。在济阳坳陷西部的惠民凹陷次生孔隙主要发育于1500-2400m深度，向东至东营凹陷则主要发育于1650-2450m，再向东到沾化凹陷为2300-3500m，车镇凹陷为2200-2700m。从西向东、由南向北次生孔隙的发育深度逐步增大是受盆地沉积沉降中心的迁移规律控制的。