湖相烃源岩有机碳含量测井预测——以渤海南部为例  

Prediction of total organic carbon content in lacustrine source rock by using well logs:Case study of southern Bohai Sea

作　　者：梁浩然[1] 牛前 徐芳艮 冯莉娅 徐国盛[1] 王德英 LIANG Haoran;NIU Qian;XU Fanggen;FENG Liya;XU Guosheng;WANG Deying(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Sichuan Yineng Oil and Gas Technology Co.Ltd.,Chengdu 610032,China;Bohai Oilfield Research Institute,Tianjin Branch,CNOOC,Tianjin 300452,China)

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]四川羿能油气技术有限公司,四川成都610032 [3]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《天然气地球科学》2024年第3期518-528,共11页Natural Gas Geoscience

基　　金：国家科技重大专项(编号:2016ZX05024-002-007);四川省科技厅应用基础研究项目(编号:2022NSFSC1093);成都理工大学校级科技项目(编号:CX2023-204);成都理工大学2023年中青年骨干教师资助计划联合资助。

摘　　要：有机碳含量(TOC)测井预测具有高纵向分辨率的特点,能够有效弥补海域钻井烃源岩样品取样数量不足的限制。烃源条件是控制渤海南部海域油气成藏的关键,为进一步明确渤南地区不同层段湖相烃源岩有机质丰度的纵向分布特征,研究依托多口钻遇大套烃源岩层段的钻井,通过多元统计法,采用“分井分层精细预测”的方式建立研究区内11口钻井的烃源岩TOC测井预测模型。传统的“多元回归法”TOC测井预测案例采用“进入法”完成预测,并未考虑误差分析,存在大量“假拟合”现象。此研究针对不同层段筛选最优测井参数组合模型,并应用“逐步回归法”规避了“假拟合”现象。研究表明,渤海南部海域发育大规模优质古近系湖相烃源岩,自沙三段上亚段至东营组沉积期,优质烃源岩分布随郯庐断裂右旋走滑作用的不断增强向北东方向迁移。Prediction of total organic carbon(TOC)content by using well logs is featured by high vertical resolu⁃tion and covers the shortage of insufficient samples in the offshore wells.As the complexity of geological condi⁃tions and the strong heterogeneity of lacustrine source rocks in the southern Bohai Sea,the controlling effect of source rock on petroleum accumulation has been recognized.In order to further reveal the organic matter abun⁃dance of lacustrine source rocks in the southern Bohai Sea,the prediction models of TOC in different layers of eleven wells were established by using multiple statistic method.The Enter method was always used in tradi⁃tional regression method during the modelling.Enter method may lead to the phenomenon of Fake fitting as the inconsideration of error analysis.Stepwise method,in which the optical combination of logging parameters were selected and the Fake fittings were completely avoided,was employed in present work to replace Enter method.The results showed that high-quality Paleogene lacustrine source rocks in large scale were developed in the Southern Bohai Sea.Moreover,the high-quality source rocks from the Upper sub-member of the third member of Shahejie Formation to Dongying Formation gradually moved northeastward as the intensification of dextral strike-slip of Tanlu Fault.

关 键 词：湖相烃源岩 测井预测 逐步回归法 有机碳含量 渤海南部海域 

分 类 号：TE122.1[石油与天然气工程—油气勘探]