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首页> 外文期刊>Petroleum exploration and development >Geologic features of fine-grained facies sedimentation and tight oil exploration: A case from the second Member of Paleogene Kongdian Formation of Cangdong sag, Bohai Bay Basin
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Geologic features of fine-grained facies sedimentation and tight oil exploration: A case from the second Member of Paleogene Kongdian Formation of Cangdong sag, Bohai Bay Basin

机译：细粒相沉积与致密油勘探的地质特征-以渤海湾盆地苍洞凹陷古近系孔店组第二段为例

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摘要

Based on analysis of successive and whole cores over six hundred meters from the second Member of Kongdian Formation (Kong 2 Member) of fine-grained facies zone in central lake basin of Cangdong sag, ten thousands of systematic and joint analysis data, and the matching logging data, the sedimentary characteristics in the fine-grained facies zone is examined by means of traditional petroleum geology, sedimentology, and new theory and method of tight oil and gas generation. The Kong 2 Member is the sedimentation during the maximum lake flooding in the Kongdian Formation. Fine-grained sedimentation of half-deep lake to deep lake are widely distributed, the fine-grained feldspar-quartz contained sedimentary rock, fine-grained mixed sedimentary rock, and dolomite are developed, and the clay rock is poorly developed. The fine-grained rocks have these features as follows: more rock compositions, less advantageous minerals; more debris minerals, less clay minerals; more analcites, less pyrites; more brittle minerals, less quartz; more rock types, less oil shale; more tight reservoirs with less non-cracked reservoirs; more high-quality source rocks, less non-source rocks; more high-frequency cycle sediments, less single sediments. These understandings updated the former view that only mud shale source rock was dominantly developed in the closed continental lake. With the help of geologic research and matched engineering technologies, several exploration wells have produced industrial oil flows, showing a good prospect of tight oil exploration in fine-grained facies zones of continental lacustrine basins.
机译：基于对苍东凹陷中部湖盆细粒相带孔店组第二段（孔2段）600米以上的连续岩心和全岩心的分析，并进行了成千上万的系统分析和联合分析数据，测井资料通过传统的石油地质，沉积学，致密油气生成新理论和新方法，对细粒相带的沉积特征进行了研究。孔2组是孔店组最大湖洪期间的沉积。半深湖至深湖的细粒沉积分布广泛，长粒石英细粒含沉积岩，细粒混合沉积岩和白云岩发育，粘土岩发育较差。细粒岩石具有以下特征：岩石成分更多，有利矿物较少;更多的碎片矿物，更少的粘土矿物;更多的止痛药，更少的黄铁矿;矿物越脆，石英越少;岩石种类更多，油页岩更少;较紧密的储层，非裂化储层较少;更多高质量的源岩，更少的非源岩;高频循环沉积物更多，单个沉积物更少。这些认识更新了以前的观点，即在封闭的大陆湖中仅泥页岩烃源岩占优势。在地质研究和配套工程技术的帮助下，几口勘探井产生了工业油流，显示出在大陆湖盆细粒相带的致密油勘探前景良好。

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