库车坳陷西秋里塔格构造带新生代沉降史分析

根据地震资料和钻井资料,应用PRA公司的BasinMod 1-D软件,利用回剥技术对西秋里塔格构造带的4个井点和邻区的两个井点进行沉降史模拟。模拟结果表明,新生代以来基底总沉降曲线与构造沉降曲线相似,沉降曲线呈上凸式。克拉苏构造带和拜城凹陷的沉降史特征与西秋里塔格构造带的沉降特征总体相似,只是各阶段的沉降速率、沉降量不同,反映了构造运动从北向南传递,沉降中心从北向南迁移的过程。西秋里塔格构造带的沉降特征主要分为5个阶段,这5个阶段的曲线形态由缓到陡,反映了新生代以来西秋里塔格构造带一直处于挤压的应力环境中,且挤压程度由弱到强,直到第四纪最终定型,为典型的前陆盆地沉降特征。亦反映了天山造山过程中,库车冲断褶皱带由北向南推进,并最终到达秋里塔格构造带的过程。     

Sedimentary characteristics and tectonic setting of sublacustrine fans in a half-graben rift depression,Beibuwan Basin,South China Sea

Drilling has shown that there is a large petroleum reserve in the Liushagang Formation of the Fushan Depression, South China Sea from reservoirs of the sublacustrine fans. To reduce the risk associated with exploration, the sedimentary characteristics of the sublacustrine fans should be identified and described. Analysis of the drilling cores, well data and 3D seismic data was conducted to identify and interpret the sublacustrine fans which formed in a lacustrine succession as the low-stand fan of the 2nd member of Liushagang Formation (SQEls2). The reservoirs were commonly associated with pebbly conglomerates, mudstone shivers, muddy debris, various deformation structures including micro-faults, liquified deformation structure, ball and pillow structure, slump and stress-release deformation. Further contrastive analysis of sedimentary characteristics and palaeogeomorphology between the western and eastern sublacustrine fans indicates that they belong to two different types of sublacustrine system in continental basins. More specifically, the western fan, controlled by the multi-level step-fault belt, is a typical gravel-rich sublacustrine system which is characterised by structurally controlled, high gradient (2.8–3.3°), admixtures of muddy debris and pebbly conglomerates and poor reservoir quality, while the eastern fan, controlled by the flexure slope-break belt, is a sand-rich sublacustrine system dominated by relatively low gradient (2.0–2.5°), general fining-upwards trend with good reservoir quality. Therefore, the development of future exploration should be conducted at different levels in the Fushan Depression.     

深层富钾卤水的地球物理探测技术及应用——以江陵凹陷为例

上世纪在江陵凹陷的石油钻孔中发现了深层富钾卤水矿层,但是卤水矿层的空间展布一直不清。借用油气勘探领域中地球物理储层预测方法和理论,利用钻孔对矿层的垂向高分辨率的识别,标定到三维地震剖面上,利用多种地震属性横向高分辨率识别卤水矿层,预测矿层的空间分布,为靶区钻孔的部署提供依据。文章利用已经发现富钾卤水矿层的路9井的资料,开展模型正演,发现地震中振幅、频率、波形等属性可以较好地识别卤水矿层;将路9井的卤水矿层标定到地震剖面上,通过提取地震属性,识别出的富钾卤水矿层平面面积达5.53 km2;在该富钾卤水区中部署的岗钾1井,钻探获得高产富钾卤水矿层,验证了地球物理探测深层富钾卤水方法的正确性。     

辽河坳陷东、西部凹陷构造活动差异性对火山岩油气成藏的控制作用

辽河坳陷东部凹陷与西部凹陷有相似的地质背景,但东部凹陷火山岩油气却明显富于西部凹陷;通过对两个凹陷的构造演化史进行研究,明确了西部凹陷与东部凹陷的构造演化差异性及其对火山岩油气藏形成条件的控制作用,结果表明:(1)辽河坳陷东部凹陷与西部凹陷构造活动差异性明显,西部凹陷裂陷期早于东部凹陷,沙四沉积后构造活动中心逐渐由西部凹陷迁移到了东部凹陷,东部凹陷断层的规模和活动性整体大于西部凹陷;(2)构造活动的差异性决定了东、西部凹陷成藏条件的差异性,东部凹陷油气输导体系(主指断裂)较西部凹陷更利于油气的运移;东部凹陷火山岩储层物性优于西部凹陷;东部凹陷火山岩的产状以及与烃源岩的接触关系较西部凹陷更便于油气的储集。     

Formation Mechanism of Potash Deposits in the Kuqa Depression and their Prediction

正The Kuqa depression in Tarim basin is abundant with petroleum exploration data,and a large number of drill cuttings data are available by drilling.A full use of these data to conduct secondary development is the most     

塔西南坳陷中新生代蒸发岩沉积初探

通过资料搜集、蒸发岩野外露头地质调查、石盐岩沉积特征分析及盐类矿物学研究,对塔里木盆地塔西南坳陷中新生代蒸发岩的分布、层位、盐类矿物组合、成因进行了初步探讨。塔西南坳陷石盐岩沉积呈透镜体状,主要沿西昆仑山前分布,常含有褐红色、灰绿色泥砾,泥砾岩性与吐依洛克组下段岩性一致,推测应为吐依洛克组沉积晚期海退期成盐,其层位应归属于吐依洛克组上段。石盐岩透镜体在横向分布上不连续,反映了当时塔西南坳陷内部可能存在多个古盐湖次级凹地,其在干旱气候条件下经浓缩蒸发成盐。蒸发岩矿物除石盐、石膏外,还见有杂卤石、钙芒硝等,其中杂卤石可能为后期富钾卤水交代原生石膏的产物,而乌泊1井石盐表面大量的次生钙芒硝可能为盐湖后期石盐析出阶段含钙地下水缓慢持续补给盐湖的产物。     

陆架边缘三角洲研究进展及实例分析

自上世纪90年代以来,发育在大陆架边缘的一种特殊类型的三角洲（shelf-edge delta）,因其厚度大,分布面积广,储层物性好,常常与陆坡深水扇体伴生,成藏条件好等特点而引起了广泛关注,成为当前国际沉积学界研究的热点和油气勘探新领域。陆架边缘三角洲一般形成于相对海平面下降或低位时期,主要受控于物源供给、可容纳空间和气候变化,并受到陆坡构造活动影响;也可发育在高位时期,受到波浪与潮汐的影响。前人提出了利用陆架边缘迁移轨迹预测深水沉积和基于陆架斜坡发育模式预测深水沉积的模型,即强烈抬升的陆架边缘迁移轨迹、强烈加积的陆架斜坡发育模式,对应的深水区物质传输体系为泥质;水平—轻微下降的陆架边缘迁移轨迹、强烈前积的陆架斜坡发育模式,预示着大量砂体被搬运至深水区;轻微抬升的陆架边缘迁移轨迹、加积与前积的陆架斜坡发育模式,暗示深水沉积砂体发育介于上述二者陆架边缘迁移与深水扇预测模式之间。陆架边缘三角洲—深水扇规模砂体毗邻优质烃源岩,具备多种类型的油气运移通道,成藏条件良好,是油气勘探的有利领域。实例分析表明:渐新世珠海组沉积时期构造相对稳定,在古珠江充足的供源条件下,南海北坡珠江口盆地鹤山凹陷发育陆架边缘三角洲并伴随陆架不断向海迁移而不断进积,S型前积体不断向海迁移,并在晚期发育下切谷及大型盆底扇沉积。鹤山凹陷珠海组沉积时期发育水平—轻微下降的陆架边缘迁移轨迹,对应于强烈前积的陆架斜坡发育模式,在珠海组沉积晚期发育较大规模叠合连片深水扇富砂沉积体系,是研究区极好的潜在油气勘探目标。     

鹿乡断陷C区块双阳组测井岩性识别及储层有效厚度的确定

针对伊通盆地鹿乡断陷五星构造带油藏,提出一种适用于本区块的测井岩性识别模式及确定储层有效厚度的方法。利用包括自然伽马(吉林伽马)、普通电阻率、声波时差和自然电位曲线的综合分析,通过绘制各类曲线交会图,确定各类岩性的有效指标范围,确认出本区可识别的6种岩石类型即泥岩、粉砂岩、细砂岩、中砂岩、粗砂岩和砂砾岩。在测井解释近似的情况下,提出反推排除法,结合区域整体沉积相带分布规律和相邻井之间的测井曲线相互关系,区分细砂岩与含砾砂岩。在测井解释的基础上进行储层有效厚度研究,建立孔隙度、渗透率、含油饱和度模型,总结出岩性下限标准、物性下限标准、电性下限标准,利用建立的模型及解释图版,对本区块的39口井进行油水层校正,编制单砂层有效厚度图和单砂层岩性-微相图。     

Structural patterns of the late Mesozoic crustal detachment system in the Raoyang Sag,Bohai Bay Basin,eastern China: New insights from 3D seismic data

Understanding the late Mesozoic tectonic origin and structural patterns of the Bohai Bay Basin (BBB) is of growing importance for its buried-hill petroleum exploration. This study revealed, based on 3D seismic and borehole data, that the Raoyang Sag in the Jizhong Depression, western BBB, was dominated by a crustal detachment system during the late Jurassic to the early Cretaceous. It was characterized by the WNW-dipping low-angle detachment fault F₀ (namely Cangxi Fault), the structural dome cored by Archean Basement rocks at the footwall and supradetachment basins on the hanging wall. We suggested the late Mesozoic volcanic materials and coarse deposits accumulated in the supradetachment basins had locally diminished the petroleum prospect, but the syndetachment deformation and denudation had contributed to it by means of promoting petroleum migration from source rocks to reservoirs and improving porosity and permeability of the reservoir rocks by karstification and structural fracturing.     

冀中坳陷饶阳凹陷留楚油田古近系东营组沉积微相及油气开发意义

留楚油田位于冀中坳陷饶阳凹陷中南部留楚构造带善旺断鼻,是古近纪东营组复杂断块油藏,目前已处于中高含水期。通过对岩心描述、小层对比与划分、单砂体沉积微相描述及测井相的综合分析,总结了留楚油田河流相砂体的主要相标志,分析认为东二段、东三段沉积时期留楚地区以低弯度曲流河沉积为主,并将主力含油单砂体所在地层划分了河道、堤岸和河漫3个亚相,以及河床滞留沉积、边滩、天然堤、决口扇、河漫滩、泛滥平原6个沉积微相;结合动态资料分析,指出沉积微相对储集层物性的控制作用,探讨了不同微相砂体的渗流特征;认为应根据不同沉积微相砂体的空间展布和层内非均质性特征,进行油藏注采关系调整和确定目标潜力区,为制订合理的油气田开发调整方案提供可靠的地质依据,为同类油藏的研究与开采提供借鉴。