Origin and accumulation of high-maturity oil and gas in deep parts of the Baxian Depression, Bohai Bay Basin, China

查看全文 作　　者：Zhao [1,2]Xianzheng;Jin [1]Qiang;Jin [2]Fengming;Ma [1]Peng;Wang [2]Quan;Wang [2]Jing;Ren [2]Chunling;Xi [2]Qiuling

机构地区：[1]School of Geosciences, China University of Petroleum;[2]Huabei Oilfield Company of PetroChina

出　　处：《Petroleum Science》索引2013年第10卷第3期,共11页

摘　　要：Great quantities of light oil and gas are produced from deep buried hill reservoirs at depths of 5,641 m to 6,027 m and 190 °C to 201 °C in the Niudong-1 Well, representing the deepest and hottest commercial hydrocarbons discovered in the Bohai Bay Basin in eastern China. This discovery suggests favorable exploration prospects for the deep parts of the basin. However, the discovery raises questions regarding the genesis and accumulation of hydrocarbons in deep reservoirs. Based on the geochemical features of the hydrocarbons and characteristics of the source rocks as well as thermal simulation experiments of hydrocarbon generation, we conclude that the oil and gas were generated from the highly mature Sha-4 Member (Es4 ) source rocks instead of thermal cracking of crude oils in earlier accumulations. The source kitchen with abnormal pressures and karsted carbonate reservoirs control the formation of high-maturity hydrocarbon accumulations in the buried hills (i.e., Niudong-1) in conjunction with several structural-lithologic traps in the Es4 reservoirs since the deposition of the upper Minghuazhen Formation. This means the oil and gas exploration potential in the deep parts of the Baxian Depression is probably high. 关键词：天然气生产渤海湾盆地中国东部成熟度石油积累碳酸盐岩储层深部

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Origin and accumulation of high-maturity oil and gas in deep parts of the Baxian Depression, Bohai Bay Basin, China

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