【摘要】 基于大量钻测资料、油气地球化学特征和流体包裹体测试分析,从烃源岩、储集层、盖层、圈闭等成藏要素及其时空匹配等对西湖凹陷中央构造带中南部纵向地层油气成藏条件、特征及富集规律进行了研究。源岩方面,平湖组煤系源岩为主要烃源岩,还原-弱还原和水动力较弱的沉积环境使源岩有机质得到很好保存;储集层方面,常规油气藏储层物性好,主要孔隙类型为原生孔和次生孔,下部低渗近致密-致密砂岩气藏物性较差,局部发育的"甜点"是有利储集体;盖层方面,花上段发育的区域盖层对花港组油气起到了较好的封闭,花下段和平湖组近致密-致密砂岩气除了常规泥岩盖层封闭外,还有致密砂岩物性封闭、气毛细管封闭和超压增压封闭;圈闭方面,花上段油气聚集在挤压反转型背斜圈闭中,而花下段、平湖组油气则聚集在非常规岩性圈闭或与构造叠加的复合圈闭中;成藏要素匹配方面,两者油气充注期与生储盖等成藏条件及其时空上都表现出有利匹配。两类油气藏的富集规律存在差异,断裂输导体系、圈闭条件和保存条件控制着花上段常规油气富集,源岩有机质丰度和物性控制平湖组近致密-致密砂岩油气富集,构造反转和断裂可能也对致密气也存在一定控制作用。更多还原

【Abstract】 Based on a large number of drilling and logging data,oil and gas geochemical testing,fluid inclusion system analysis technology,this paper summarizes and compares conditions,characteristics and enrichment regulation of oil and gas accumulation of the south central of central anticlinal zone in the Xihu Sag of the East China Sea Basin from source rock,reservoir stratum,cap rock,trap and their matching relation.Organic matter of source rock in Pinghu Formation has been carefully preserved in weak reductionreduction and weakly hydrodynamic depositional environment.Huagang Formation has good reservoir physical properties,whose main pore type is primary pores and secondary pores,and Pinghu Formation has bad reservoir physical properties,whose main pore type is secondary pores.Developing a"sweet"reservoir is favorable.The regional caprock in upper of Huagang Formation is effectively sealed gas.There exists a mudstone caprock,tight sandstone physical property and capillary sealing of gas and overpressure in Pinghu formation.Oil and gas in the Huagang Formation is gathered in anticlinal traps and in the Pinghu Formation it is gathered in unconventional lithologic trap and hydrodynamic trap.Hydrocarbon-charging times are well matched with conditions of oil and gas accumulation.The two types of condensate gas reservoirs have different enrichment regulations.Oil and gas were controlled by faults conduit systems,trap and preservation condition in Huagang Formation and by organic abundance of hydrocarbon source rock and physical property in Pinghu Formation.更多还原