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济阳坳陷孔店组油气源及其成藏作用研究
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摘要
为了查明孔二段烃源岩对济阳坳陷油气成藏的贡献,选取了东营凹陷王家岗-丰深1井、高青、惠民凹陷林樊家、临商断裂带和沾化凹陷孤北-渤南洼陷等疑似孔二段原油成藏地区为研究对象,综合利用石油地质、地球化学和地球物理资料及前人研究成果,对其进行了油源对比和成藏作用分析。例如,王家岗地区发现的10多个油藏分别来源于孔二段和沙四段烃源岩,其中一些油藏为孔二段与沙四段烃源岩的混源油,还有个别油藏为生物降解型原油。对混源油藏进行了混合比例计算,认为孔二段烃源岩贡献率为50~80%。也就是说,该区原油主要源自孔二段,发育孔店组自生自储型和奥陶系潜山新生古储型成藏模式,其它油源来自沙四段并且在沙河街组成藏,还发育孔二段和沙四段原油混合成藏模式。成藏地质特征及成藏要素综合分析认为,孔二段和沙四上烃源岩供烃能力、运移通道组合形式和圈闭有效性控制了油气近距离运移形成不同的成藏组合,是油气成藏的主要控制因素。
     研究发现上述区块均有孔二段来源的原油,而且与沙河街组原油混合成藏的作用明显,是进一步勘查孔店组油气源的有利目标。其中东营凹陷北部陡坡带孔一段、沙四段砂砾岩体和盐下构造圈闭是孔二段凝析油和裂解气聚集的最有利场所,临商断裂带、林樊家构造北部和樊家背斜深层孔店组构造油藏较为发育,孤北深层古潜山圈闭和渤南深洼带盐下圈闭也是孔二段油气的聚集区。
The Ek_2 source rock was first founded from the Well Wang-46 in the Dongyin depression in 2004. Oil accumulations discovered in the Wangjiagang, Well Fengshen-1, Gaoqing, Linfanjia, Linshang and Gubei-Bonan areas were believed as a genetic relation with the Ek_2 source rock. This paper conducts an oil-source correlation and hydrocarbon accumulation model over those areas, and finds an excellent hydrocarbon potential of the Ek_2 source rock for oil accumulations in the studied areas. Therefore, this investigation gives new ideas to oil exploration in the Jiyang Super-depression.
     Having investigated on oil accumulation process, four accumulating models are established in the Wangjiagang area.(1) oil is generated and accumulated in the Kongdian Formation; (2) oil is generated from Ek_2 but accumulated in the Ordovician buried-hill; (3) oil is sourced from Es4 and stored in the same and upper strata; (4)oils in some reservoirs are generated either from Ek_2 or Es_4 source rocks, i.e. the mixed oil. According to geochemical features of the mixed oil, the oil from the Ek2 source rock is about 50~80%. The Ek_2 and the Es_4 oil kitchens, the trap efficiency and the migration pathway control the hydrocarbon accumulations in the Wangjiagang area.
     On oil-source correlation, it recognizes that the oil from Ek_2 source rock is common in the studied areas, and always mixes with the oil from Es4 source rock. The lithologic and“salt base”structural traps are the most advantageous locations for condensate and cracking gas in Es4 and Ek1 in the steep slope zone and central anticline zone in the Dongying depression. Linshang fault zone, north of Linfanjia structural belt and Fanjia anticline are advantageous places for exploring structural reservoirs in the Kongdian Formation, buried hill traps in the hanging walls of the boundary faults and the“salt base”traps are also have perfect prospect in Gubei -Bonan sag.
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