松南新区重点断陷九佛堂组烃源岩影响因素研究

Influencing factor of Jiufuotang Formation hydrocarbon source rock for important fault depression in new exploration area of southern Songliao Basin

刘玉华 张建丽

中国石化东北油气分公司勘探开发研究院，吉林 长春 130000 中国石化集团中原石油勘探局信息中心，河南 濮阳 457001

Research Institute of Exploration and Development, Northeast Oil and Gas Company, SINOPEC, Changchun 130000, China Information Center, Zhongyuan Petroleum Exploration Bureau, SINOPEC, Puyang 457001, China)

以松南新区8个断陷22口探井所钻遇的暗色泥岩为研究对象，采用有机地球化学方法刻画了该区暗色泥岩的生烃潜力特征，总结出烃源岩发育控制因素。研究认为，松南新区九佛堂组烃源岩有机质丰度较高，有机质类型以Ⅰ和Ⅱ1型为主，少数为Ⅲ型，黑色泥岩及油页岩是该区优质烃源岩，但整体生烃能力有限，Ro实测数据表明，烃源岩整体处于低熟—成熟演化阶段。裂陷强度控制了烃源岩的规模、质量，断陷结构影响烃源岩空间展布，反转强度控制烃源岩的定位和演化程度，火山背景促进了水生生物的繁盛以及优质烃源岩的形成。综合烃源岩评价结果认为，松南新区彰武、昌图、大冷断陷勘探前景最好。

Taking the dark mudstone from 22 exploration wells of 8 fault depressions in new exploration area of southern Songliao Basin as a study object, this paper depicts the hydrocarbon?鄄generating potential characteristics of dark mudstone using organic geochemistry method and sums up the controlling factor of hydrocarbon source rock development. It is considered that the organic matter abundance of Jiufuotang Formation hydrocarbon source rock is high, mainly by TypeⅠ and Ⅱ1, a few TypeⅢ. Black mudstone and oil shale are good hydrocarbon source rocks in this area, but the hydrocarbon?鄄generating potential is limited on the whole. The reflectance of vitrinite(Ro) data shows that the hydrocarbon source rocks are at low mature to mature stage. The scale and quality of source rock are controlled by rift strength and the spatial distribution of hydrocarbon source rock is effected by rift structure. The localization and evolution degree of hydrocarbon source rock are controlled by inversion intensity. Volcano promotes the prosperity of aquatic organisms and the formation of high quality hydrocarbon source rock. The evaluation results of hydrocarbon source rock show that the exploration prospects of Zhangwu, Changtu and Daleng fault depressions in this area are the best.

10.6056/dkyqt201405003