大宁—吉县区块深部煤层气富集主控因素分析及地质工程甜点区评价  

Analysis of Main Controlling Factors of Deep Coalbed Methane Enrichment and Evaluation of Geological and Engineering Sweet Areas in Daning-Jixian Block

作　　者：王成旺 刘新伟 李曙光[1,2] 熊先钺 王玉斌 陈高杰 WANG Chengwang;LIU Xinwei;LI Shuguang;XIONG Xianyue;WANG Yubin;CHEN Gaojie(Zhonglian Coalbed Methane National Engineering Research Center Co.,Ltd.,Beijing 100951,China;PetroChina Coalbed Methane Co.,Ltd.,Beijing 100020,China;Engineering Technology Research Institute,PetroChina Coalbed Methane Co.,Ltd.,Xi’an,Shaanxi 710082,China)

机构地区：[1]中联煤层气国家工程研究中心有限责任公司,北京100951 [2]中石油煤层气有限责任公司,北京100020 [3]中石油煤层气有限责任公司工程技术研究院,陕西西安710082

出　　处：《西安石油大学学报（自然科学版）》2024年第4期1-9,共9页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技重大专项(2016ZX05042);中石油煤层气有限责任公司科技重大专项(2020-KJ-04)。

摘　　要：精准评价和合理优选煤层气地质工程甜点区是翔实制定勘探开发一体化方案的基础。本文聚焦大宁—吉县区块深部石炭系本溪组8^(#)煤层,充分利用研究区煤心描述、分析化验、测录井、地震及开发动态等资料,通过研究区深部8^(#)煤层的各种资料系统整理和深入剖析,从煤层顶底板岩性、厚度、构造、沉积环境及煤岩特征等方面,系统探讨了深部煤层气富集的主控因素,并建立了地质工程甜点区评价标准,进而划分了研究区的地质工程甜点区。研究结果表明,煤层气富集主要受顶底板岩性、构造及煤岩特征等影响,沉积环境对煤层气富集的影响多体现在顶底板岩性组合及封闭性等特征上;研究区评价出地质一类、工程一类有利区411.5 km^(2),资源量1 038.75×10^(8) m^(3);地质二类、工程一类有利区596.2 km^(2),资源量1 192.4×10^(8) m^(3);地质二类、工程二类有利区287.4 km^(2),资源量574.5×10^(8) m^(3)。Accurate evaluation and reasonable selection of geological engineering dessert areas for coalbed methane are the basis for detailed formulation of integrated exploration and development plans of coalbed methane.Through in-depth analysis of coal core description,chemical analysis,logging,seismic data,and development dynamics of the 8~# coal seam in the deep Carboniferous Benxi Formation of the Daning-Jixian block,the main controlling factors of deep coalbed methane enrichment were discussed from the aspects of the roof and floor lithology and thickness of coal seam,structure,sedimentary environment,and coal rock characteristics.The evaluation criteria for geological and engineering sweet areas were established,and the geological engineering sweet spot areas in the study area were further divided.The research results indicate that the enrichment of coalbed methane is mainly influenced by the roof and floor lithology,structure and coal rock characteristics,and the influence of sedimentary environment on coalbed methane enrichment is mainly reflected in the combination and sealing characteristics of the roof and floor rock.According to evaluation result,in the study area,there are geological class I-engineering class I favorable area of 411.5 km^(2),with a resource volume of 1 038.75×10^(8) m^(3),geological class II-engineering class I favorable area of 596.2 km^(2),with a resource volume of 1 192.4×10^(8) m^(3) and the geological class II-engineering class II favorable area of 287.4 km^(2),with a resource volume of 574.5×10^(8) m^(3).

关 键 词：深部8~#煤层 甜点区评价 煤层气 主控因素 地质工程 大宁—吉县区块 

分 类 号：P618.13[天文地球—矿床学]