中上扬子区海相层系流体特征与油气保存条件

Fluid characteristics and hydrocarbon preservation conditions in marine facies strata of middle-upper Yangtze region

通过对中上扬子区地层水化学特征、地层水氢氧硫同位素、天然气组成特征、天然气烷烃碳同位素、甲烷氢同位素、天然气轻烃组成特征等的研究,结合油气显示及产出情况将中上扬子区流体特征划分为5大区,即:川中—川西区(Ⅰ)、川北—川东—川南区(Ⅱ)、江汉盆地南部(Ⅲ)、黔东南坳陷区(Ⅳ)和湘鄂西区、黔中及邻区、江汉盆地北部等区(Ⅴ),其对应的油气保存条件逐渐变差。

Based on studies of formation water chemical characteristics, H, O and S isotopes in formation water, natural gas composition, C isotope in alkane, H isotope in methane and light hydrocarbon composition in the middle-upper Yangtze region, combined with petroleum shows and productions, the research area was divided into 5 blocks according to fluid characteristics： the middle and western Sichuan Basin （Ⅰ）, the northern, eastern and southern Sichuan Basin （ Ⅱ ）, the southern Jianghan Basin （ Ⅲ）, the depression in the southeast of Guizhou Province （Ⅳ）, as well as the west of Hunan and Hubei Provinces, the middle of Guizhou Province, and the northern Jianghan Basin （Ⅴ）. Preservation conditions decrease from Ⅰ to Ⅴ.