Sequence patterns for the marine strata in potential oil and gas pools in the central Yangtze area
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摘要: 通过中扬子区海相地层油气成藏背景的分析,成藏有利区层序样式基本特征的研究和油气成藏有利区的预测,笔者认为在具备盖层条件的前提下,有利区应该具备烃源条件和储集条件配置关系良好,一方面H型二级层序样式格架中海侵体系域烃源岩具备较多的T型三级层序或较少的H型三级层序;另一方面,H型二级层序样式格架中高位体系域储集岩具备较多的H型三级层序或较少的T型三级层序。中扬子区的下古生界总体上保存条件优越,有利区主要位于湘鄂西、宜昌斜坡和江汉平原南部;上古生界总体上保存条件差异性明显,有利区主要位于渝东-鄂西区和江汉平原区。Abstract: The present paper discusses the sedimentary-tectonic settings of oil and gas accumulation in marine strata, sequence patterns for the marine strata and areas prospective for oil and gas pools in the central Yangtze area. Such an area should be well made up of source rocks, hydrocarbon reservoirs and seals. More precisely, the source rocks of the transgressive systems tract within the H-type second-order sequence framework consist of more T-type and/or less H-type third-order sequences, whereas the hydrocarbon reservoirs of the highstand systems tract within the H-type second-order sequence framework are composed of more H-type and/or less T-type third-order sequences. The potential areas in the Lower Palaeozoic strata include western Hunan and Hubei, Yichang slope, and southern Jianghan Plain, and those in the Upper Palaeozoic strata involve eastern Chongqing, western Hubei and Jianghan Plain.
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