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辽河盆地西部凹陷南部在沙三段沉积时期断陷活动强烈 ,发育了巨厚的深水泥岩和多期次缓坡型湖底扇沉积 ,为油气聚集成藏提供了丰富的油气源条件和储集条件。沙三段沉积时期 ,该区发育有齐家杜家台和锦州欢喜岭两大湖底扇沉积体系。受物源和基底构造的控制 ,湖底扇平面上可划分为内扇、中扇和外扇 3个亚相带。齐家杜家台和锦州欢喜岭湖底扇在沙三段沉积早期规模较小 ,中期规模最大 ,晚期萎缩。该区沙三段储层物性普遍较差 ,以低孔特低孔、低渗特低渗储层为主 ,其中湖底扇中扇辫状沟道微相砂体储集性能最好 ,平面上依中扇辫状沟道→中扇前缘→外扇亚相储层物性由好变差
In the southern part of the western sag of Liaohe Basin, the faulted depression during the sedimentary period of the third member of Shahejiechuan Formation was intense, with thick deep-water shale and sub-gentle sublacusser sublacustrine fan deposits, which provided abundant oil and gas source conditions and reservoir conditions for hydrocarbon accumulation. During the deposition of the third member of the Shahejie Formation, there are two sedimentary systems of the two major lakes, namely Qijia Dujiaotai and Jinzhou Huanxiling. Under the control of provenance and basement structure, the sublacustrine fan plane can be divided into three sub-facies such as inner fan, middle fan and outer fan. Qijia Dujiaotai and Jinzhou Huanxiling Lake bottom fan were smaller in scale in the early stage of sedimentation in the third member of the Eocene, with the largest scale in the middle stage and atrophy in late stage. The reservoir in the third member of the Shahejie Formation is generally poor in character, with low porosity and low permeability, low permeability and low permeability reservoirs, of which the fan-braided trench microfacies in the sublacustrine fan have the best reservoir properties. On the plane According to the medium fan braided trench → fan front → outer fan subphase reservoir property from good to poor