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济阳坳陷埕岛潜山油气成藏特征
林会喜,熊伟,王勇,秦峰,景安语,王秀红,张明华,冯月琳,刘静
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(1.中国石化石油勘探开发研究院,北京100083;2.中国石化胜利油田分公司勘探开发研究院,山东东营257015)
摘要:
为了揭示埕岛潜山油气成藏规律,以指导该区潜山油气勘探有利目标优选,综合运用有机地球化学、同位素和原油物性等资料,系统进行了埕岛潜山精细油源对比、油气藏特征和油气运聚过程研究。结果表明:埕岛潜山明显受埕北20断层和埕北30北断层控制,分割为西、中、东排山,受源储配置、输导方式等油气成藏条件的控制,西、中、东排山油气来源、运聚过程和富集规律各异。西排山以埕北凹陷控盆的埕北断层为油源断层,油气垂向运聚为主,在埕北断层上升盘的断鼻和断块圈闭成藏,表现为含油面积小且独立、顶部风化壳油藏富集的特点;中排山以埕北20断层和一系列北北东向走滑断层为油源输导断层,渤中凹陷生成的油气沿走滑断层走向运聚,再侧向分配至邻侧圈闭中聚集成藏,表现为油气沿大型走滑断裂带分布的特征;东排山的油气来源于黄河口凹陷沙三段下亚段烃源岩,油气通过多套不整合和断裂复合输导体系在多层系富集。不同潜山油气差异性运聚的特点,决定了不同潜山勘探方向亦有所不同。
关键词:  油源对比  成藏条件  富集规律  侧向运聚  走向运聚  潜山  济阳坳陷
DOI:10.13673/j.cnki.cn37-1359/te.2021.01.001
基金项目:国家科技重大专项“渤海湾盆地精细勘探关键技术”(2016ZX05006)
Hydrocarbon accumulation in Chengdao buried hill of Jiyang Depression
LIN Huixi,XIONG Wei,WANG Yong,QIN Feng,JING Anyu,WANG Xiuhong,ZHANG Minghua,FENG Yuelin,LIU Jing
(1.Petroleum Exploration & Production Research Institute,SINOPEC,Beijing City,100083,China;2.Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)
Abstract:
To reveal the hydrocarbon accumulation law in Chengdao buried hill and thus optimize favorable targets for oil and gas exploration in the buried hill,we systematically studied the fine oil-source correlation,reservoir characteristics,and hydrocarbon migration and accumulation in Chengdao buried hill,depending on organic geochemistry,isotope,and physical properties of crude oil. Research demonstrates that Chengdao buried hill is governed by Fault Chengbei 20 and North Fault Chengbei 30,which is divided into three zones:west,middle,and east buried hills. Influenced by accumulation conditions such as source-reservoir configuration and migration patterns,the sources,migration,accumulation and enrichment of hydrocarbon in the three zones are different. Fault Chengbei serves as the oil source for west buried hills,which connects with the source rock of Chengbei Sag and traps hydrocarbon(mainly migrating and accumulating vertically)in the faulted nose and faulted blocks on the uplifted side. The oil-bearing area is small and independent,and the top weathering crust is enriched by hydrocarbon. In middle buried hills,Fault Chengbei 20 and a series of NNE strike-slip faults can transport oil from sources. Oil and gas generated in Bozhong Sag migrate and accumulate along the strike-slip fault and then travel laterally to the adjacent traps for accumulation,presenting as an overall distribution along large-scale strike-slip faults. Moreover,in east buried hills,oil and gas originate from source rocks in the Lower Submember of the third Member of Shahejie Formation in Huanghekou Sag. They are enriched in multiple strata through diversified sets of composite transport systems consisting of unconformities and faults. Differential hydrocarbon migration and accumulation in buried hills determine their orientation of exploration.
Key words:  oil-source correlation  accumulation conditions  enrichment law  lateral migration  migration along fault strike  buried hill  Jiyang Depression

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