李越哲, 殷杰, 叶琳等.南堡凹陷沙一段烃源岩综合识别及分布预测[J].河南理工大学学报（自然科学版）,2024,43(4):56-67.

LI Y Z, YIN J, YE L, et al. Comprehensive identification and distribution prediction of source rocks in the first member of Shahejie Formation in the Nanpu Sag[J]. Journal of Henan Polytechnic University(Natural Science) , 2024, 43(4): 56-67.

南堡凹陷沙一段烃源岩综合识别及分布预测

李越哲, 殷杰, 叶琳, 王振奇

长江大学 地球科学学院，湖北 武汉 430100

摘要:  目的 针对南堡凹陷烃源岩在不同次凹中具有明显非均质性这一问题，深入开展烃源岩层系识别与分布预测研究。 方法 选取对有机质较敏感的测井曲线，对研究区不同沉积相带采用Δlg R 法和多元线性回归法分别建立烃源岩TOC定量预测模型，并依据预测结果对比验证，优选预测模型；同时确立工区烃源岩地震反射特征与地化特征的对应关系，建立单井烃源岩-地震相-沉积相关系，并进行横向追踪。  结果 结果表明，研究区多元线性回归法预测TOC误差较小，可较好地满足TOC预测精度。优质烃源岩TOC测井曲线以箱形为主，偶夹锯齿状特征曲线，地震反射特征主要呈中-强振幅、中-高频、高连续性，并具亚平行-平行反射结构；中等烃源岩TOC测井曲线以高值尖峰锯齿状为主，地震反射特征为中-弱振幅、中-低频、连续-较连续，并具亚平行反射结构。 结论 南堡凹陷沙一段烃源岩主要在3个区域发育，面积最大的地区位于林雀次凹5号和1号构造带之间，其次为高柳断层与西南庄断层接合部的上盘以及3号构造带附近。研究结果可为南堡凹陷非常规油气藏勘探开发提供理论指导。

关键词:南堡凹陷;沙一段;烃源岩;测井响应;分布预测

doi:10.16186/j.cnki.1673-9787.2022060055

基金项目:国家自然科学基金资助项目（41402111）；湖北省博士后创新岗位基金资助项目（9621000812）

收稿日期:2022/06/22

修回日期:2022/09/28

出版日期:2024/07/15

Comprehensive identification and distribution prediction of source rocks in the first member of Shahejie Formation in the Nanpu Sag

LI Yuezhe, YIN Jie, YE Lin, WANG Zhenqi

School of Geosciences, Yangtze University, Wuhan 430100, Hubei, China

Abstract: Objectives To address the significant heterogeneity of hydrocarbon source rocks across different sub-depressions in the Nanpu Sag, this study conducts an in-depth investigation to identify these source rocks and predict their distribution. Methods Logging curves that are sensitive to organic matter were selected, and a quantitative prediction model for hydrocarbon source rock TOC was established using the Δlg R method and multiple linear regression method for different sedimentary facies in the study area. The prediction results were compared and verified to select the optimal prediction model. Additionally, the correlation between seismic reflection characteristics and the geochemical properties of the source rocks in the Nanpu Sag was established, developing a relationship among single-well source rocks, seismic facies, and sedimentary facies, along with lateral tracing. Results The results indicate that the multiple linear regression method has a small prediction error for TOC, effectively meeting the precision required for TOC prediction. The TOC logging curves of high-quality hydrocarbon source rocks are mainly box-shaped, occasionally interbedded with serrated characteristic curves. The seismic reflection characteristics primarily exhibit medium to strong amplitude, medium to high frequency, high continuity, and feature sub parallel-parallel to parallel reflection structures. The TOC logging curve of medium hydrocarbon source rocks is characterized by high-value peak sawtooth shapes, with seismic reflection characteristics of medium to weak amplitude, medium to low frequency, and continuity to relative continuity, exhibiting sub-parallel reflection structures. Conclusions The source rocks of the Es₁ in the Nanpu Sag are mainly developed in three regions. The largest area is located between the 5th and 1st structural belts of the Linque Sag, followed by the hanging wall at the junction of the Gaoliu Fault and the Xinanzhuang Fault, as well as near the 3rd structural belt. The research results can provide theoretical guidance for the subsequent exploration and development of unconventional oil and gas reservoirs in the Nanpu Sag.

Key words:Nanpu Sag; Es;source rock; well logging response; distribution prediction