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黄骅坳陷王官屯地区中—古生界油气成藏条件与成藏模式
勾琪玮,蒋有录,刘景东,吕雪莹,姜文亚
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(1.中国石油大学(华东)地球科学与技术学院,山东青岛266580;2.中国石油大港油田公司勘探开发研究院,天津300280)
摘要:
黄骅坳陷王官屯地区中—古生界储层钻遇多口高产油气井,勘探潜力较大。基于地质、地化、地震及测井、录井资料,对王官屯地区的烃源岩、储盖组合等油气成藏条件进行分析,通过流体包裹体技术和沥青显微荧光观察,明确油气成藏期次与时间,恢复油气成藏过程并建立油气成藏模式。研究结果表明:王官屯地区孔二段为主力供烃层系,混有少量石炭系—二叠系油气源,生烃条件好;发育多套优质储层,中—古生界和上覆新生界发育泥岩、膏岩及煤层等多套区域性盖层,储、盖组合和保存条件好;源、储间具有供烃窗口,断层与不整合、砂体等构成复合输导体系,输导条件优越。石炭系—二叠系烃源岩生成的油气向砂岩和下伏奥陶系碳酸盐岩中运聚成藏,孔二段烃源岩生成的原油通过断层向中—古生界充注成藏,整体上,王官屯地区中—古生界潜山具有“多向供烃,复合输导,近源成藏”的特征。
关键词:  中—古生界;古潜山  油气成藏条件;成藏模式;黄骅坳陷
DOI:10.13673/j.cnki.cn37-1359/te.2020.06.007
基金项目:国家科技重大专项“渤海湾盆地深层油气地质与增储方向”(2016ZX05006-007)。
Hydrocarbon accumulation conditions and patterns of the Mesozoic and Paleozoic in Wangguantun area of Huanghua Depression
GOU Qiwei,JIANG Youlu,LIU Jingdong,Lü Xueying,JIANG Wenya
(1.School of Geosciences,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China;2.Exploration & Development Research Institute,Dagang Oilfield Company,PetroChina,Tianjin City,300280,China)
Abstract:
In Wangguantun area of Huanghua Depression with considerable potential of exploration,many oil and gas wells with high yield have been drilled in the Mesozoic and Paleozoic reservoirs. Based on the geological,geochemical,seismic,well logging and log data,the hydrocarbon accumulation conditions such as source rocks and reservoir-cap rock assemblages in Wangguantun area were analyzed. Through fluid inclusion technology and fluorescence microscopy of asphalt,the oil and gas accumulation stage and period were determined. Meanwhile,the hydrocarbon accumulation process was restored and its pattern was established. The results show that the Wangguantun area has good hydrocarbon generation conditions,in which Ek2 is the main hydrocarbon supply series of strata,with a small amount of the Carboniferous and Permian oil and gas sources mixed. High-quality reservoirs and regional cap rocks are well preserved,with regional cap rocks of mudstone,gypsolyte,and coal seam developing in the Mesozoic and Paleozoic as well as the overlying Cenozoic. The transport conditions are superior,as the hydrocarbon supply window exists between source rocks and reservoir,which are connected by the composite hydrocarbon transporting system consisting of fault with unconformity and sand body. Oil and gas from the Carboniferous and Permian source rocks are migrating into sandstone and underlying Ordovician carbonate rocks to be entrapped,while oil and gas from Ek2 source rocks are injected into the Mesozoic and Paleozoic through faults to be entrapped. As a whole,the buried hills of the Mesozoic and Paleozoic in Wangguantun area are featured by“multi-directional hydrocarbon supplies,composite transportation,and near-source accumulation”.
Key words:  Mesozoic and Paleozoic  buried hill  hydrocarbon accumulation conditions  accumulation pattern  Huanghua Depression

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