岩性油气藏 ›› 2023, Vol. 35 ›› Issue (3): 5165.doi: 10.12108/yxyqc.20230305
薛楠1,2, 邵晓州1,2, 朱光有3, 张文选4, 齐亚林1,2, 张晓磊1,2, 欧阳思琪5, 王淑敏1,2
XUE Nan1,2, SHAO Xiaozhou1,2, ZHU Guangyou3, ZHANG Wenxuan4, QI Yalin1,2, ZHANG Xiaolei1,2, OUYANG Siqi5, WANG Shumin1,2
摘要: 通过对鄂尔多斯盆地西南缘平凉北地区三叠系长7段15口井的暗色泥岩样品进行地球化学分析,结合测井解释成果,推断出其古沉积环境,总结了烃源岩质量的主控因素及发育模式。研究结果表明:①平凉北地区三叠系长7段烃源岩有机质丰度自下而上逐渐减小,长73亚段有机质丰度最大,长72亚段次之,长71亚段最小。长73亚段烃源岩有机碳质量分数最高可达12.4%,生烃潜力大,有机质类型以Ⅰ型和Ⅱ1型为主,是一套处于成熟阶段的好-优质湖相烃源岩。②平凉北地区长73亚段沉积期气候潮湿温暖,为陆相淡水环境。较高的古生产力、缺氧还原水体为有机质的生长、繁殖和保存创造了有利条件。③平凉北地区长73亚段发育火山-热液型烃源岩。火山活动与热水沉积共同影响着长73亚段的水体环境,其较高的古生产力是有机质大量生成的基础,缺氧还原环境是有机质完整保存的关键因素。
中图分类号:
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