东海盆地西湖凹陷黄岩地区油气成藏主控因素及成藏模式

西湖凹陷西次凹黄岩地区渐新统花港组油气资源丰富,是东海陆架盆地勘探开发重要领域,但油气成藏机理复杂。为厘清西次凹花港组油气成藏过程,笔者等通过薄片观察、扫描电镜、流体包裹体、显微测温等实验分析,结合构造演化、埋藏史等,开展了生储盖、成藏期次及成藏过程研究。结果表明,花港组砂岩储层具有良好的储集条件,始新统平湖组发育有效的烃源岩,还具有良好的圈闭条件和保存条件。早期发育的断裂,延深至下部平湖组烃源岩层内,可以作为良好的运移通道,深部超压的发育为油气运移也提供一定的动力。因此建立了“垂向叠置”成藏模式,说明西湖凹陷深层低渗—特低渗致密岩性—构造复合油气藏和深部地层存在异常压力系统内的油气藏的具有良好的勘探前景。     

Petroleum Retention,Intraformational Migration and Segmented Accumulation within the Organic-rich Shale in the Cretaceous Qingshankou Formation of the Gulong Sag,Songliao Basin,Northeast China

In this study, organic geochemical and petrological analyses were conducted on 111 shale samples from a well to understand the retention, intraformational migration and segmented accumulation(shale oil enrichment in different intervals is unconnected) features of shale oil within the organic-rich shale in the Qingshankou Formation of the Gulong Sag. Our study shows that retained petroleum characteristics in the investigated succession are mainly influenced by three factors: organic richness, int...     

二连盆地乌兰花凹陷烃源灶表征及其对油气分布的控制

乌兰花凹陷是近年来在二连盆地南部新发现的富油凹陷,但南北两个洼槽探明的油气资源差异明显。为了准确评价乌兰花凹陷的油气资源潜力,系统地分析了乌兰花凹陷烃源灶特征,讨论了烃源灶与油藏分布的关系。研究表明,乌兰花凹陷阿尔善组至腾一上段发育C、D/E和F相源岩,受构造-层序演化的影响,南北洼槽倾油型(C相)源岩发育层段存在明显差异,南洼槽C相源岩主要发育在阿尔善组,腾一上段和下段以D/E相源岩为主,而北洼槽阿尔善组至腾一上段均发育C相源岩。多口探井热史标定结果表明,乌兰花凹陷烃源岩成熟门限在2000 m左右,南洼槽仅阿尔善组烃源岩进入成熟阶段,阿尔善组C相源岩排油强度为0.5～7.9MMT/km2,为凹陷的主力烃源岩,而北洼槽阿尔善组C相烃源岩主要发育在阿尔善组上段,成熟度较低,最大值仅为0.78%Ro,烃源灶排烃强度小于0.2 MMT/km2,不能形成规模性的油藏。乌兰花凹陷探明的原油均在南洼槽,且集中在烃源灶周围,表现为近源聚集。     

东海西湖井身结构深度优化技术及其应用

东海西湖地区深部地层具有研磨性强,可钻性差,机械钻速低,且存在异常高温高压等特点。通过不断探索、实践井身结构优化技术,形成了东海近几年较为固定的探井井身结构。但表层?444.5 mm井眼再加速遭遇“瓶颈”,常压深井井身结构仍有优化空间。随着东海钻井技术的不断进步及油气资源勘探开发的需求,水平井及大斜度井的数量在不断增多,而开发井?215.9 mm井眼水平段?177.8 mm尾管下入困难。因此,需要进一步对东海西湖凹陷区域井身结构进行深度优化。针对以上难点,研究形成了表层井眼尺寸优化技术、深井井身结构简化技术及开发井尾管尺寸优化技术。现场试验应用表明,钻井提速效果明显,为后续井的井身结构继续优化奠定了基础。同时也降低了深部井段复杂情况出现的概率,增大了探井套管和井眼环空间隙,为后续作业提供了便利,也为复杂地质条件下深井和超深井的井身结构的设计提供了新的思路。     

Polygonal faulting and petroleum geological significance of Qn1 formation in the Sanzhao Sag,Songliao BasinEI北大核心CSCD

Numerous small-scaled, extensional faults occur densely in the mudstone layer of the Qingshankou 1st member (Qn1) in Songliao Basin. Its attribute and genetic mechanism are highly concerned but still controversy. The high-resolution 3D seismic datasets of a new block that covers most of the Sanzhao sag of Songliao Basin is studied., The characteristics of the profile and plane geometry of the extensional fracture system in the Sanzhao sag were depicted in detail through fine seismic interpretation using coherent technology. Based o the results, we proposed that: (1) The extensional fault system is mainly polygonal fault, which probably resulted from rupture pressure related to the episodic hydrocarbon-expulsion from the mudstone of Qn1. However, the tectonic inversion in Songliao Basin may also contribute to the formation and development of the polygonal fault system; (2) The polygonal faults were mainly formed by the end of deposition period of the Nenjiang Formation, and some experienced vertical direction propagation caused by the strong tectonic inversion at the end of deposition period of the Mingshui Formation; (3) The polygonal faults connect the Qn1 hydrocarbon source rock with the underlying Fuyang oil layer and the overlying Putaohua oil layer, and thus are important migration channels for the oil and gas accumulation; (4) Until the end of deposition period of the Nenjiang Formation, hydrocarbon generated in the Qn1 mainly migrated downward into the underlying Fuyang oil layer via the small polygonal faults rather than upwards to the Putaohua oil layer. On the contrary, by the end of deposition period of the Mingshui Formation, the oils from Qn1 source rock can migrate either downward into the Fuyang oil layer or upward into the Putaohua oil layer. It is noteworthy that the vertical propagation of the polygonal faults induced by the tectonic inversion might also damage the Fuyang accumulations formed earlier. ©, 2015, Science Press. All right reserved.     

金湖凹陷泰州组成藏条件研究

随着金湖凹陷古近系勘探程度的提高和勘探难度的加大,具有良好成藏条件的泰州组油气勘探工作也日益引起重视。本文从油源、储层、盖层及构造等方面对金湖凹陷泰州组成藏条件进行了研究分析,认为油源条件是泰州组能否成藏的关键,通过对金湖凹陷泰州组四个有利区带的详细分析,认为铜城断裂带泰州组成藏条件最为有利。     

准噶尔盆地吉木萨尔凹陷中-上二叠统沉积相特征

准噶尔盆地东部吉木萨尔凹陷中-上二叠统由上芨芨槽子群、泉子街组、梧桐沟组组成．凹陷内中-上二叠统经历了低水位域→高水位域→低水位域的变化过程，其有利相带以扇三角洲和三角洲相为主，主要发育于东斜坡区的东北部及东南部以及凹陷南北两侧断裂下盘，在南北局部的乌拉泊组和梧桐沟组还发育浊积扇．油气显示集中于三角洲或扇三角洲相带内(芦草沟组、梧桐沟组)，凹陷腹部深湖-半深湖相内的扇三角洲和三角洲沉积区是凹陷内油气的最有利聚集区和保存区．     

乌石凹陷古近系层序地层特征及充填演化

依据层序地层学、沉积学理论方法,综合地震剖面、钻测井、岩心、古生物、地球化学等资料研究认为;乌石凹陷古近系可识别3种级别不整合面,划分为7个三级地震(测井)层序,是一个进积(加积)—退积—加积序列。构造沉降是控制层序几何形态,充填叠置方式、演化及沉积体系分布的最重要因素:凹陷由多个半地堑在不同层序发育时期以不同方式叠置联结而成;受断层控制,层序外部形态有箱状-楔形、楔形-席状披覆型,边界终止方式有双断终止型、单断终止超覆型;不同构造演化阶段层序内部充填的沉积体系各具特征,初始断陷阶段的SQ1沉积冲积层序,强烈断陷阶段的SQ2—SQ4充填湖相层序,晚期断陷阶段SQ5—SQ7内部充填浅湖和河流三角洲沉积;同沉积断层陡坡带沉降迅速、可容纳空间快速增长,是凹陷的沉积和沉降中心,断陷期主控断裂活动时间和空间的变化导致了凹陷沉积和沉降中心的迁移。     

辽河盆地东部凹陷新生代伸展-走滑构造作用及断裂构造特征

基于最新的三维地震资料处理与地震剖面解释、地震相干切片分析和平衡剖面恢复等方法,对辽河盆地东部凹陷所发育的断裂几何形态、盆地演化过程和走滑构造平面特征进行研究,并结合区域板块构造活动背景,分析其对郯庐断裂带新生代时期活动的响应.结果表明:辽河盆地东部凹陷为伸展和走滑两期构造变形叠加的产物,是具有"下断上坳"双层结构的裂谷型盆地.盆地演化过程经历了强烈断陷期(Es3)、区域隆升期(Es2)、断坳转化期(初始走滑期)(Es1)、坳陷沉降期(强烈走滑期)(Ed)和构造反转期(Ng-现今)5个演化阶段.研究区主要发育正断层、逆断层、走滑正断层和走滑逆断层4种断层类型,经伸展间歇期和后期区域挤压作用,发育两期正反转构造.盆地经历的走滑运动过程可细化为初始走滑(Es1),强烈走滑(Ed)和衰减走滑(Ng)3个阶段.