王大兴,胡海燕,邹佳群,王涛,朱根根,陈笑宇,梁烁

• 1:长江大学资源与环境学院
• 2:新疆大学地质与矿业工程学院
• 3:长江大学地球科学学院

摘要(Abstract)：

为探明准噶尔盆地二叠系下乌尔禾组页岩气富集条件及主控因素，以东道海子凹陷下乌尔禾组为研究对象，通过野外地质观察、录井、测井、地震等资料的收集，结合总有机碳含量测定、X衍射全岩分析、岩心观察、气体吸附(N_2、CO_2)等手段，对下乌尔禾组页岩的分布特征、有机质发育特征、储层特征及含气性特征进行了研究。结果表明：(1)下乌尔禾组页岩总有机碳含量(w(TOC))较高，平均1.58%;有机质类型以Ⅱ_2型和Ⅲ型为主；镜质体反射率R_o平均1.46%,处于成熟阶段；烃源岩厚度平均75 m,烃源岩较好，生气潜力大。盆地模拟结果表明下乌尔禾组页岩含气量较好，平均1.89 m~3/t。(2)页岩储集层粒内孔和微裂缝较为发育；气体主要吸附于微孔和介孔；孔隙度均值6.10%,渗透率均值为0.27×10~(-3)μm~2,有利于页岩气的聚集。(3)页岩黏土矿物体积分数较高，均值29.6%,能提供较高的比表面积，增加页岩的气体吸附能力；脆性矿物体积分数均值50.9%,压裂改造性良好。(4)页岩储层压力系数较大，均值为1.58,具有良好的保存条件。结合区域构造—沉积环境以及地化参数的分析表明，东道海子凹陷下乌尔禾组页岩气成藏的主控因素包括地化参数和保存条件，其中有机质热演化成熟度高、页岩厚度大、w(TOC)高、良好的保存条件等是影响页岩气富集的关键因素。基于上述条件，提出东道海子凹陷页岩气勘探开发有利区位于凹陷的腹部偏东北斜坡地区。该研究成果揭示了东道海子凹陷下乌尔禾组页岩气富集条件及主控因素，对准噶尔盆地腹部地区深层油气勘探具有借鉴意义。

关键词(KeyWords)： 陆相页岩;页岩气富集;主控因素;下乌尔禾组;东道海子凹陷;准噶尔盆地

Abstract:

Keywords:

基金项目(Foundation): 中国石油化工股份有限公司重大科技资助项目“准噶尔盆地及周缘矿权战略选区及评价研究”(P21086-4)

作者(Author): 王大兴,胡海燕,邹佳群,王涛,朱根根,陈笑宇,梁烁

DOI: 10.19509/j.cnki.dzkq.tb20230184

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