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通过苏里格气田西区北部苏48井-苏143井剖面的地质研究,分析上古生界气藏的成藏机制,结果表明,其成藏期充注动力的原因是生烃增压,下部山1段主要烃源层段因生烃产生的充注动力大小约为18 MPa,上部盒8段主要储层发育段充注动力约为9~15 MPa。在区域整体下生上储的源储配置格局下,烃源岩层的过剩压力最大,充注动力由下至上逐渐减少,表明充注动力随油气运移距离的增大而消耗降低。盒8段充注动力-物性-含气性比较说明,成藏期充注动力越大,气藏的含气性越好。
Through the geological study of the section Su-48 and Su-143 of the western section of the western Sulige gas field, the mechanism of gas accumulation in the Upper Paleozoic gas reservoir is analyzed. The results show that the reason for filling the reservoir during the hydrocarbon accumulation period is that hydrocarbon generation and pressurization, The main dynamic charge of one main hydrocarbon source section is about 18 MPa due to hydrocarbon generation. The dynamic charge of the main reservoir development section of upper 8 blocks is about 9-15 MPa. Under the pattern of source-reservoir configuration under the whole area, the excess pressure of the source rock strata is the largest, and the charging power decreases gradually from bottom to top, which shows that the charging power decreases with the increase of hydrocarbon migration distance. Box 8 section filling dynamic - physical properties - gas-containing comparison shows that the accumulation of filling power, the better the gas-containing gas reservoir.