焦作矿区煤系含气系统基本要素研究  

Research on basic elements of coal measure gas-bearing system in Jiaozuo mining area

作　　者：徐影 宛宗瑞 卢玉杰 杨樱花 Xu Ying;Wan Zongrui;Lu Yujie;Yang Yinghua(Henan Yuzhong Geological Exploration Engineering Co.,Ltd.,Zhengzhou 450016,China;Energy Drilling Engineering Technology Research Center of Henan Province,Zhengzhou 450016,China;Henan Academy of Geology,Zhengzhou 450016,China;Henan Provincial Natural Resources Science and Technology Innovation Center(Research on Unconventional Natural Gas Development),Zhengzhou 450016,China)

机构地区：[1]河南豫中地质勘查工程有限公司,河南郑州450016 [2]河南省能源钻井工程技术研究中心,河南郑州450016 [3]河南省地质研究院,河南郑州450016 [4]河南省自然资源科技创新中心(非常规天然气开发研究),河南郑州450016

出　　处：《能源与环保》2024年第6期116-125,共10页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：2019年度河南省自然科技项目(2019-3)。

摘　　要：煤系气是重要的天然气资源,明确煤系含气系统的基本要素对于煤系气勘探开发至关重要。以焦作矿区石炭—二叠系海陆过渡相含煤岩系为例,基于区内煤系气勘探资料,从生、储、盖及上覆岩层4方面,探讨了研究区煤系含气系统的基本要素及其特征。研究表明,焦作矿区石炭—二叠系烃源岩以煤和暗色泥岩为主,马厂1井太原组、山西组和下石盒子组泥岩的TOC含量分别为1.68%、0.905%和4.35%,二1煤顶底板泥岩的S_(1)+S_(2)含量分别为0.452、0.576 mg/g,达到了较好—好烃源岩级别;从镜质组含量、类型指数等方面,判定烃源岩为Ⅲ型有机质类型;烃源岩热演化程度整体处于成熟—过成熟阶段,处于主生气期。储集层以煤为主,其次为泥岩和部分砂岩,其含气量分为11.54~23.16、1~3、0.18~1.47 m^(3)/t,储集层矿物组成主要为石英和黏土矿物,主要发育植物胞腔孔和气孔,孔隙度介于0.80%~11.08%,渗透率介于0.004×10^(-3)~0.012×10^(-3)μm^(2),具有低孔低渗的物性特征;太原组、山西组和下石盒子组泥岩的饱和气突破压力为5.88~9.80 MPa,饱和煤油突破压力为13.72~14.11 MPa,具有很好的封闭能力。研究认为,焦作矿区石炭—二叠系煤系含气系统基本要素的组合关系为,烃源岩发育于太原组至下石盒子组,优势储集层为山西组,上石盒子组为区域盖层,第四系及新近系为研究区上覆岩层。Coal measure gas is an important natural gas resource,and clarifying the basic elements of the coal measure gas-bearing is crucial for the exploration and development of coal measure gas.Taking the coal measure gas-bearing system of the Carboniferous-Permian transitional phase in the Jiaozuo mining area as an example,the basic elements and characteristics of the coal measure gas-bearing system in the study area were systematically described from four aspects:generation,storage,seal,and overlying strata.The results show that the hydrocarbon source rocks in the Carboniferous-Permian series in the mining area are mainly composed of coal and dark mudstone.The total organic carbon(TOC)contents of mudstones in the Taiyuan Formation,Shanxi Formation,and Lower Shihezi Formation of Machang 1 Well are 1.68%,0.905%,and 4.35%,respectively.The contents of S_(1)+S_(2) in the mudstone of the roof and floor of theⅡ_(1) coal seam is 0.452 and 0.576 mg/g,respectively,reaching a good level of hydrocarbon source rock.From the aspects of vitrinite content and type index,it was determined that the source rock was of typeⅢorganic matter type.The overall degree of thermal evolution of hydrocarbon source rocks was in the mature to over mature stage,and was in the main gas generation stage.The reservoirs are mainly composed of coal,followed by mudstone and some sandstone.Its gas content is divided into 11.54-23.16,1-3,and 0.18-1.47 m^(3)/t.The mineral composition of the reservoir is mainly quartz and clay minerals,mainly developing plant cell pores and pores.The porosity ranges from 0.80%to 11.08%,and the permeability ranges from 0.004×10^(-3) to 0.012×10^(-3)μm^(2),exhibiting low porosity and low permeability physical properties.The saturation pressure at which gas starts to be released from Taiyuan Formation,Shanxi Formation,and Lower Shihezi Formation mudstones ranges from 5.88 to 9.80 MPa,and the breakthrough pressure of saturated kerosene is 13.72-14.11 MPa,with good sealing capacity.Research suggests that the combination rela

关 键 词：煤系含气系统 烃源岩 储集层 盖层 上覆岩层 基本要素 

分 类 号：P618.13[天文地球—矿床学]