从主力烃源岩的角度论江陵凹陷新沟咀组下段油气资源潜力

The Oil & Gas Resource Potential of Xingouzui Formation in Jiangling Depression from Angle of Chief Source Rock,Jianghan Saline Basin

主力烃源岩研究是近来油气资源评价中的一大热点。以江汉盐湖盆地江陵凹陷为例,从主力烃源岩的角度,利用盆地模拟法,综合分析了凹陷新沟咀组下段主力烃源岩分布特征、生排烃量、生排烃高峰期及油气资源潜力。结果表明,江陵凹陷新沟咀组下段主力烃源岩厚度大,有机质丰度较高,生油母质较好,且主要分布于资福寺向斜带,烃源岩主体处于成熟-高成熟阶段;生、排油中心位于资福寺向斜带,主要生排油期分别位于荆沙组至潜江组沉积期、潜江组至荆河镇组沉积期,剩余资源潜力较大,且主要分布于荆州油气聚集区;荆州油气聚集区为最有利的油气勘探区带,公安油气聚集区为有利的油气勘探区带。

The study on chief source rock is a focal point in the evaluation of oil ＆ gas resource recently. Taking Jiangling depression in Jianghan saline basin as an example, following issues are analyzed in this article such as the characters of chief source rock, the amount of hydrocarbon generation and expulsion of the source rock, the primary times of hydrocarbon generation and expulsion of the source rock,and oil ＆ gas resource potential by using the methods of basin modeling. It is demonstrated that the thickness of chief source rock of Xingouzui formation in Jiangling depression is larger, the abundance of organic matters in the source rock is high, and the types of organic matters in the source rock are better; the chief source rock is mainly located in Zifusi syncline belt, and the maturity of organic matters in the source rock is mainly maturity to high maturity. The center of hydrocarbon generation and expulsion of the source rock is mainly located in Zifusi syncline belt, and the primary times of hydrocarbon generation and expulsion of the source rock are at the deposit period of Jingsha to Qianjiang formation, and Qianjiang to Jinghezhen formation, respectively. The residual potential of oil ＆ gas resource of Xingouzui formation in the depression is bigger, and is mainly located in Jingzhou oil ＆ gas accumulation play. The best play is Jingzhou oil ＆ gas accumulation play, and the better play is Gong＇an oil ＆ gas accumulation play.