青藏羌塘地区隐伏裂陷槽的识别及油气远景

介绍了青藏高原羌塘盆地和措勤盆地的深部磁场特征,用隐伏裂陷槽的观点分析了这些特征。结合ＭＴ电性层深度图和中生界沉降带的厚度,将南北向正磁异常带(东经89°－90°)解释成晚古生代隐伏裂陷槽。该裂陷槽对北羌塘坳陷中生代的构造单元、沉积以及油气组合有很重要的控制作用。     

辽河油田坨32井区中生界火山岩岩石学特征及成因

坨32井区火山岩岩石类型主要有流纹岩、粗安岩、安山岩,流纹质火山角砾岩,流纹质凝灰岩,安山质火山角砾岩,安山质凝灰岩。火山岩的喷发时代为(97.37±1.41)Ma和(79.52±1.25)Ma,喷发为两期5次,第1期为早白垩世晚期,第2期为晚白垩世中期。火山的喷发具有“反序”现象,利用岩浆流体动力学理论论证了这种“反序”现象是因为存在带状岩浆房,并建立了带状岩浆房和地表火山岩分布的模型。     

松辽盆地中生界火山岩储层特征及对气藏的控制作用

火山岩储层是松辽盆地深层天然气勘探的主要目的层,分布上主要受深大断裂控制,沿断裂成带分布,不仅分布在山岭地区也广泛分布在断陷盆地的沉积地层中;储集空间为原生气孔、杏仁体内孔、次生的斑晶溶蚀孔、基质内溶孔和构造溶蚀裂缝;孔隙结构组合为单一裂缝及斑晶溶蚀孔与裂缝组合而成的孔隙结构;在成因上分为喷发溢流时形成原生气孔,喷发间歇期受风化淋滤形成次生孔隙及在埋藏过程中成岩、构造作用的影响 3个阶段;裂缝是改善火山岩储层性能的关键因素,成岩作用既加剧了次生孔隙的充填也加剧了溶蚀孔隙的形成,压实作用对储层物性没有影响。火山岩在烃源岩中相对独立的分布使其具有得天独厚的成藏条件,构造运动和后期风化剥蚀是控制储层物性的主要因素,断裂的发育程度控制了气藏的分布。     

EASY%Ro模型在我国西部中生代盆地热史研究中的应用

有机质的成熟度主要是由其经历的热历史所决定的,基于二者之间的对应关系,不仅可以通过热史对成熟度进行研究和模拟,而且科研生产中更经常,更需要做的一作是根据有机质的成熟度来反演其所经历的热史。     

塔里木盆地轮南地区中生界油藏油源分析

针对塔里木盆地轮南地区中生界油藏油源问题,从原油含腊量、孢子花粉、烃源岩沉积环境以及构造活动等文献进行了尝试性分析。认为轮南地区中生界的油气表现为混源特点,主要为来自北部库车坳陷中生界自生的油气,部分为源自南方加尔凹陷古生界生成的油气。基于这一观点,指出今后该区中生界勘探应以寻找中三叠统沉积背斜圈闭和上三叠统岩性圈闭为主。     

PETROLEUM GEOLOGY AND HYDROCARBON POTENTIAL OF THE GUBAN BASIN,NORTHERN SOMALILAND

The Guban Basin is a NW‐SE trending Mesozoic‐Tertiary rift basin located in northern Somaliland (NW Somalia) at the southern coast of the Gulf of Aden. Only seven exploration wells have been drilled in the basin, making it one of the least explored basins in the Horn of Africa – southern Arabia region. Most of these wells encountered source, reservoir and seal rocks. However, the wells were based on poorly understood subsurface geology and were located in complex structural areas. The Guban Basin is composed of a series of on‐ and offshore sub‐basins which cover areas of 100s to 1000s of sq. km and which contain more than 3000 m of sedimentary section. Seismic, gravity, well, outcrop and geochemical data are used in this study to investigate the petroleum systems in the basin. The basin contains mature source rocks with adequate levels of organic carbon together with a variety of reservoir rocks. The principal exploration play is the Mesozoic petroleum system with mature source rocks (Upper Jurassic Gahodleh and Daghani shales) and reservoirs of Upper Jurassic to Miocene age. Maturity data suggest that maximum maturity was achieved prior to Oligocene rift‐associated uplift and unroofing. Renewed charge may have commenced during post‐ Oligocene‐Miocene rifting as a result of the increased heat flows and the increased depth of burial of the Upper Jurassic source rocks in localised depocentres. The syn‐rift Oligocene‐Miocene acts as a secondary objective owing to its low maturity except possibly in localised offshore sub‐basins. Seals include various shale intervals some of which are also source rocks, and the Lower Eocene evaporites of the Taleh Anhydrite constitute an effective regional seal. Traps are provided by drag and rollover anticlines associated with tilted fault blocks. However, basaltic volcanism and trap breaching as a consequence of the Afar plume and Oligocene‐Miocene rifting of the Gulf of Aden cause considerable exploration risk in the Guban Basin.     

塔里木盆地三叠－侏罗系储集体成因类型与分布

塔里木盆地北部三叠系为一套辫状三角洲（夹扇三角洲）－湖泊沉积体系、南部为正常三角洲－湖泊沉积体系；而侏罗系为宽浅湖盆中的河流－滨钱湖沉积体系。塔里木盆地三叠－侏罗系储集体类型包括辫状三角洲砂岩体、扇三角洲砂岩体、三角洲砂岩体、河流砂岩体和滨浅湖砂岩体等。辫状三角洲砂岩体或扇三角洲砂岩体分布在北部陡坡，厚度向南增大；三角洲砂岩体分布在盆地南部，厚度向拗陷边缘减小；滨浅湖砂岩体和河流砂岩体则分布在环湖中心及盆地边缘。     

塔北地区中,新生界油气藏的形成,分布及勘探远景

塔里木盆地北部中、新生界油气藏形成条件较好,在库车凹陷具有形成大油气田的基本石油地质条件,在组合条件较好的其他地区,可形成中、小型油气田(藏)群.本区中、新生界油气田(藏)的分布具三种模式.区内已在震旦系至上第三系的九个层系内发现了规模不等的油气藏,其中80%集中在中、新生界内(主要分布在古隆起及斜坡带),表明塔里木盆地北部中、新生界有广阔的油气勘探远景.     

下扬子区中生界构造特征及油气远景

下扬子区中生界包括海相和陆相沉积，中生代演化分为６个地质阶段；（１）早、中三叠世稳定沉各积；（２）晚三叠世推覆运动；（３）早、中侏罗世前陆盆地；（３）晚侏罗世走滑作用；（５）早白垩世挤叠盆地；（６）晚白垩世拗陷盆地。     

济阳坳陷煤型气源岩特征及资源前景

根据济阳坳陷深层大量钻井，地震和分析化验资料，研究了石炭二叠系中生界２套煤系的赋存状况及地化特征，探讨了“二次生气”的时期，门限深度和门限成熟度，计算了“二次生气”量的煤型气聚集量，并展望了煤型气勘探前景。