四川盆地焦石坝地区五峰组龙马溪组页岩层序地层划分及含气性预测——以JY-2井为例  

Sequence stratigraphic division and gas bearing prediction of the Wufeng-Longmaxi Formation shale strata in the Jiaoshiba area,Sichuan Basin——Taking well JY-2 as an example

作　　者：刘天娇 张妍煜 赵迪斐[3,4,5] LIU Tianjiao;ZHANG Yanyu;ZHAO Difei(College of Earth Science and Engineering,Shandong University of Science and Technology,Shandong Qingdao266590,China;School of Resources and Earth Science,China University of Mining and Technology,Jiangsu Xuzhou 221116,China;Artificial Intelligence Research Institute,China University of Mining and Technology,Jiangsu Xuzhou 221116,China;Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,Ministry ofEducation,Jiangsu Xuzhou 221008,China;Key Laboratory of Sedimentary Mineralization and Sedimentary Minerals,Shandong Qingdao 226590,China)

机构地区：[1]山东科技大学地球科学与工程学院,山东青岛266590 [2]中国矿业大学资源与地球科学学院,江苏徐州221116 [3]中国矿业大学人工智能研究院,江苏徐州221116 [4]煤层气资源与成藏过程教育部重点实验室,江苏徐州221008 [5]山东省沉积成矿作用与沉积矿产重点实验室,山东青岛266590

出　　处：《非常规油气》2022年第2期34-41,共8页Unconventional Oil & Gas

基　　金：刘宝珺地学青年科学基金项目“五峰组—龙马溪组页岩沉积精细微相特征及其对储层发育的控制”(DMSMX2019002);江苏省大学生创新训练项目“超高精度纳米储层孔隙结构探测与重构技术”(202110290304H)。

摘　　要：四川盆地焦石坝地区上奥陶统五峰组—下志留统龙马溪组发育了一套富有机质泥页岩,是华南地区海相地层中的优质烃源岩之一,且分布面积广,页岩气开发工作成效显著,但对于这套细粒沉积物层序内部体系域的划分界面认识还不一致。根据岩性、岩相和测井参数对海平面响应的敏感变化特征,对JY2井五峰组—龙马溪组的体系域和层序界面进行了识别和分析,分析高分辨率层序与页岩含气性的关系。结果表明JY2井五峰组—龙马溪组第1个三级层序的海侵体系域发育泥页岩气层,高位体系域发育泥页岩含气层和泥页岩气层;第2个三级层序的低位体系域发育泥页岩气层、含气层和泥页岩含气层。整体来看,泥页岩气层的甲烷和全烃含量是最高的,含气性最好,其次为含气层和泥页岩含气层。研究结果对于建立研究区内的高精度层序地层格架具有指导意义,同时将为四川盆地及其周缘五峰组—龙马溪组页岩气和世界其他地区海相页岩气勘探开发提供参考。The Wufeng Formation of Upper Ordovician-Longmaxi Formation of Lower Silurian in the Jiaoshiba area of the Sichuan Basin developed a set of organic-rich shale,which is one of the high-quality source rocks in marine strata of south China.The shale gas development has achieved remarkable results due to its wide distribution area,but the understanding of the dividing interface of the internal system tract of this set of fine-grained sediment sequences is not consistent.According to the sensitive change characteristics of lithology,lithofacies and well logging parameters to sea level response,the system tract and sequence boundaries of Wufeng-Longmaxi Formation in well JY2 were identified and analyzed,and the relationship between high resolution sequence and shale gas content was investigated.The first tertiary sequence of Wufeng Formation-Longmaxi Formation in well JY2 has shale gas-bearing layers,and the highstand system tract develops shale gas-bearing layers and shale gas layers.The low-stand system tract of the second tertiary sequence develops shale gas layers,gas-bearing layers and shale gas-bearing layers.On the whole,mud shale gas layers have the highest methane and total hydrocarbon content,and have the best gas-bearing properties,followed by gas-bearing layers and shale gas-bearing layers.The research results have guiding significance for the establishment of high-precision sequence stratigraphic framework in the study area,and will provide reference for the exploration and development of shale gas in Sichuan Basin and its surrounding Wufeng-Longmaxi Formation and marine shale gas in other regions of the world.

关 键 词：层序地层学 页岩气 四川盆地 焦石坝地区 五峰组—龙马溪组 

分 类 号：P131.1[天文地球—天体力学]