岩性油气藏 ›› 2015, Vol. 27 ›› Issue (2): 1825.doi: 10.3969/j.issn.1673-8926.2015.02.004
王 朋1,柳广弟1,曹 喆1,苏 惠2,常俊合2
WANG Peng1, L IU Guangdi1, CAO Zhe1, SU Hui2, CHANG Junhe2
摘要:
有效烃源岩识别是沉积盆地油气成藏研究的基础,其分布对油气成藏具有重要的控制作用。 结合烃源岩生排烃特征,分析烃源岩中可溶有机质氯仿沥青“A”和热解参数S1 与 TOC 含量的关系,认为对查干凹陷下白垩统油气藏的形成具有重大贡献的烃源岩,其 TOC 质量分数均在 1.0%以上。 利用测井Δlog R 法预测单井 TOC 含量,并以 TOC 含量下限值作为评价标准进一步确定不同探井有效烃源岩的厚度及其平面展布特征。 结果表明,查干凹陷有效烃源岩主要发育于缓坡带,深洼陷有效烃源岩厚度较小甚至不发育,油气藏也主要位于缓坡带附近或其上倾方向。通过源藏叠合、油源对比和生烃期与成藏期匹配等分析,认为缓坡带有效烃源岩所生成烃类在原地或经砂体和断层等输导体系近距离运移至圈闭并聚集成藏,缓坡带有效烃源岩的分布对研究区油气成藏具有重要的控制作用。
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