鄂尔多斯盆地陇东地区长7油层组烃源岩非均质性控制因素研究

Control Factors of Source Rock Heterogeneity in Chang 7 Reservoir in Longdong Area of Ordos Basin

利用总有机碳、氯仿沥青"A"、烃源岩热解、镜质体反射率、生物标志化合物和测井曲线等分析测试结果,探讨了陇东地区长7油层组烃源岩特征,从宏观到微观系统地阐述了烃源岩的非均质性:宏观上,长7油层组烃源岩有机质丰度受埋藏深度的控制呈现一定的非均质性,而有机质类型主要受沉积环境及相带的控制呈现一定的非均质性;微观上,由于母质来源、沉积环境等的变化,导致干酪根在显微组分上存在一定的非均质性。

By using analysis and test results of total organic carbon,chloroform bitumen'A',hydrocarbon source rock pyrolysis,vitrinite reflectance,biomarkers and logging curve,the source rock characteristics of Chang 7Reservoir in Longdong Area were studied.Its heterogeneity was explained from macro to micro systematic exposition.From the macroscopic aspect,the abundance of organic matter of source rocks in Chang 7Reservoir presents heterogeneity under the control of buried depth and the type of organic matter is mainly controlled by sedimentary facies environment which present heterogeneity at some extent.From the microscopic aspect,due to changes in parent material sources,depositional environment,etc,it results in certain heterogeneity of kerogen in the microscopic components.