汪深1井天然气成因类型及气源分析

汪深1井在营城组获得高产气流，利用天然气碳同位素和气组成判别出天然气甲、乙烷为煤型气，丙烷为油型裂解气，煤型气所占的比例为96％，油型气所占的比例为4％。通过汪深1井天然气直接和间接对比认为，天然气甲烷碳同位素与宋站、徐家围子地区沙河子组源岩吸附气的碳同位素接近，综合研究认为天然气中甲烷气主要来自汪家屯地区及宋站地区沙河子组煤系地层，是主力源岩。徐家围子断陷沙河子组煤系地层为次要源岩。天然气中丙烷可能来源于宋站、安达断陷登娄库组泥岩。依据源岩排气强度估算出天然气大约90％来自该井区和宋站、徐家围子地区。

Genetic type and source of the gas in well Wangshen No.1

High gas rate is obtained in Well Wangshen No.1 in Yingcheng Member. The carbon isotope and gas component is used to identify that the methane and ethane belong to coal-related gas,while propane belong to petroliferous pyrolysis gas.The coal-related gas occupies 96%,and the petroliferous pyrolysis gas occupies 4%. The direct and indirect comparison of the gas in Well Wangshen No.1 shows that its methane carbon isotope is close to that of the adsorbed gas in the source rock of Shahezi Member in Xujiaweizi area.A comprehensive study concludes that the methane gas mainly comes from the coal measure strata in this area and Shahezi Member in Songzhen area,being major source rock.The coal measure strata in Shahezi Member in Xujiaweizi Rifit is minor source rock.The propane in the gas might be mainly sourced from the mudstone of Denglouku Member in Songzhan and Anda Rift.Estimation according to the gas expulsion strength shows that about 90% of the gas comes from this area and Songzhan and Xujiaweizi area.