楚雄盆地上三叠统舍资组泥页岩储层特征分析——以滇禄地3井为例  

Shale Reservoir Characteristics in the Upper Triassic Shezi Formation in Chuxiong Basin:A Case Study of Well Yunnan-Ludi 3

作　　者：客昆 秦建华[1] 牟必鑫 余谦[3] 魏洪刚[2] 郝学峰 陈杨[2] 客达 周家云[1] 龚大兴[1] QIE Kun;QIN Jian-hua;MOU Bi-xin;YU Qian;WEI Hong-gang;HAO Xue-feng;CHEN Yang;QIE Da;ZHOU Jia-yun;GONG Da-xing(Institute of Multipurpose Utilization of Mineral Resources, CAGS, Chengdu 610041, China;Sichuan Coal Geological Engineering Design and Research Institute, Chengdu 610072, China;Chengdu Center, China Geological Survey, Chengdu 610081, China;Yunnan Institute of Geological Survey, Kunming 650216, China;Bureau of Geophysical Prospecting, INC., China National Petroleum Corporation, Zhuozhou 072750, China)

机构地区：[1]中国地质科学院矿产综合利用研究所,成都610041 [2]四川省煤田地质工程勘察设计研究院,成都610072 [3]中国地质调查局成都地质调查中心,成都610081 [4]云南省地质调查院,昆明650216 [5]中国石油集团东方地球物理勘探有限责任公司,涿州072750

出　　处：《科学技术与工程》2021年第28期12020-12030,共11页Science Technology and Engineering

基　　金：中国地质调查局项目(DD20160182-08)。

摘　　要：海陆过渡相泥页岩是页岩气勘探开发的重要领域,以楚雄盆地滇禄地3井上三叠统舍资组泥页岩为研究对象,结合泥页岩的有机地化特征,运用扫描电子显微镜、全岩X-射线衍射分析、孔隙度与渗透率测量实验、现场解析实验、核磁共振等技术对滇禄地3井岩心样品进行分析测试,进而分析泥页岩储层特征。结果表明:滇禄地3井上三叠统舍资组泥页岩干酪根类型均为Ⅱ_(2)型,舍资组下段泥页岩有机碳(total organic carbon,TOC)含量相对较高,主要集中在0.4%~2.25%,有机质成熟度主要处于过成熟阶段,矿物主要由脆性矿物、碳酸盐矿物、黏土矿物组成,其中脆性矿物含量相对较高,平均为40.87%,有利于页岩气的压裂,孔隙度在0.6%~1.6%,平均为1.01%,渗透率在0.0009652×10^(-3)~0.0335421×10^(-3)μm^(2),平均为0.007027×10^(-3)μm^(2),表现出低孔、低渗特征;储集空间类型以黏土矿物层间缝、颗粒粒缘缝为主,孔隙以微孔、小孔为主,含少量中孔,孔隙之间连通性较差,含气量在0.06~1.00 m^(3)/t,平均值为0.564 m^(3)/t。与中国已取得突破的海陆过渡相页岩气勘探区进行页岩气地质条件对比可见:楚雄盆地上三叠统舍资组泥页岩具有良好的页岩气勘探潜力。Marine-terrestrial transitional shale is an important filed of shale gas exploration and development.Core samples of Upper Trassic Shezi Formation were taken as the research object from well Yunnan-Ludi 3 in Chuxiong Basin.Multiple experiments were carried out to analyze the characteristics of shale reservoirs.These experiments included organic geochemical test,scanning electron microscope,whole-rock X-ray diffraction,porosity and permeability measurement,and nuclear magnetic resonance.The results show that the kerogen type of shale in Shezi Formation of Upper Triassic in well Yunnan-Ludi 3 is type II_(2).The total organic carbon(TOC)contents of shales are relatively greater in the lower member of Shezi formation,mainly concentrated in 0.4%~2.25%.The organic matter maturity of shales is mainly in the over-mature stage and the minerals are mainly composed of brittle minerals,carbonate minerals and clay minerals.The content of brittle minerals is relatively high and the average is 40.87%,which is conducive to the fracturing of shale gas.The porosity is 0.6%~1.6%,with an average of 1.01%,and the permeability is 0.0009652×10^(-3)~0.0335421×10^(-3)μm^(2),with an average of 0.007027×10^(-3)μm^(2).The pore types are mainly micro-pores and small pores,with a small number of middle pores.The connectivity between pores is poor,and the gas content is relatively low between 0.06~1.00 m^(3)/t,and the average is 0.564 m^(3)/t.It can be concluded that shales of Upper Triassic Shezi Formation in Chuxiong Basin has good shale gas exploration potential when compared to other marine-terrestrial transitional shales in China.

关 键 词：楚雄盆地 滇禄地3井 舍资组 泥页岩 储层特征 

分 类 号：P624[天文地球—地质矿产勘探]