鄂尔多斯盆地南部延长组长7段页岩气储层评价
发布时间：2018-09-04 05:42
【摘要】：论文以鄂尔多斯盆地南部中生界三叠系延长组长7页岩储层作为研究对象,通过对研究区地质资料的大量收集和整理,并充分利用野外露头、钻井、录井、测井以及薄片分析、扫描电镜、有机地球化学等多种分析测试手段,深入、系统地研究了鄂尔多斯盆地南部延长组长7页岩气储层特征并对其进行综合评价。研究表明,鄂尔多斯盆地南部延长组长7时期以半深湖-深湖相为主,是富有机质页岩发育的有利相带。研究区暗色泥页岩厚度较大,分布稳定。论文通过岩性、岩相划分及X-衍射全岩分析发现,长7段暗色泥质岩系的岩性多为含泥铁质细粉砂质粗粉砂岩、细粉砂岩、铁质泥岩、炭质页岩,多为细粉砂质粗粉砂结构。碎屑成分主要为石英、长石、云母,少量酸性喷出岩、变质岩等岩屑,脆性矿物含量相对较高。长7暗色泥岩有机质含量高,生烃潜力大。有机碳含量在0.88~25.46%之间,平均含量4.96%。有机质类型以Ⅱ型为主。镜质体反射率在0.52-1.13%之间,进入了热催化生油气阶段。借助扫描电镜发现,长7页岩孔隙类型以粒间微孔及溶蚀微孔为主。孔隙度分布范围在0.5%-3.5%之间,以1-2%为主,平均值为1.82%;渗透率以小于0.01×10-3μm2为主。研究区多口探井在长7泥岩中气测显示异常,气体为有机成因的热解气,赋存状态以吸附态、游离态和溶解态并存。钻井取心实测含气量大于2m3/t,含气量受暗色泥岩厚度、岩相、TOC、矿物组分、保存条件等多因素影响。根据页岩气成藏条件,借鉴国内外页岩气储层评价标准,建立了适合研究区的页岩气储层评价标准。笔者将暗色泥岩厚度、有机质含量(TOC)以及有机质成熟度(Ro)三个主要参数叠合,并综合考虑埋深、沉积相带等相关参数指标,预测了研究区延长组长7段页岩气的有利目标区及远景区,为该区下一步页岩气的勘探开发提供了借鉴。
[Abstract]:The paper takes the Mesozoic Chang 7 shale reservoir of the Mesozoic Yanchang formation in the southern Ordos Basin as the research object, through collecting and sorting a large amount of geological data in the study area, and making full use of field outcrop, drilling, logging, logging and thin slice analysis. Scanning electron microscope (SEM), organic geochemistry and other analytical and testing methods are used to study the shale gas reservoir characteristics of Yanchang No. 7 formation in the southern Ordos Basin and to evaluate them comprehensively. The results show that in Yanchang formation of southern Ordos Basin, the semi-deep lacustrine-deep lacustrine facies is dominant, which is a favorable facies zone for the development of organic matter rich shale. In the study area, the thickness of dark shale is large and the distribution is stable. Through lithology, lithofacies division and X-ray diffraction analysis, it is found that the lithology of dark shaly rock series in Chang7 formation is mainly composed of fine silty sandstone, iron mudstone, carbonaceous shale and fine silty coarse silt structure. The clastic components are mainly quartz, feldspar, mica, a small amount of acid exhalation rock, metamorphic rock and so on, and the content of brittle minerals is relatively high. Chang7 dark mudstone has high organic matter content and great hydrocarbon generation potential. The organic carbon content was between 0.88% and 25.46%, and the average content was 4.96%. The type of organic matter is mainly type 鈪，
本文编号：2221182
[Abstract]:The paper takes the Mesozoic Chang 7 shale reservoir of the Mesozoic Yanchang formation in the southern Ordos Basin as the research object, through collecting and sorting a large amount of geological data in the study area, and making full use of field outcrop, drilling, logging, logging and thin slice analysis. Scanning electron microscope (SEM), organic geochemistry and other analytical and testing methods are used to study the shale gas reservoir characteristics of Yanchang No. 7 formation in the southern Ordos Basin and to evaluate them comprehensively. The results show that in Yanchang formation of southern Ordos Basin, the semi-deep lacustrine-deep lacustrine facies is dominant, which is a favorable facies zone for the development of organic matter rich shale. In the study area, the thickness of dark shale is large and the distribution is stable. Through lithology, lithofacies division and X-ray diffraction analysis, it is found that the lithology of dark shaly rock series in Chang7 formation is mainly composed of fine silty sandstone, iron mudstone, carbonaceous shale and fine silty coarse silt structure. The clastic components are mainly quartz, feldspar, mica, a small amount of acid exhalation rock, metamorphic rock and so on, and the content of brittle minerals is relatively high. Chang7 dark mudstone has high organic matter content and great hydrocarbon generation potential. The organic carbon content was between 0.88% and 25.46%, and the average content was 4.96%. The type of organic matter is mainly type 鈪，
本文编号：2221182
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