摘要
为解决煤层气勘探开发过程中煤岩品质评价问题,梳理出煤岩品质评价关键要素为“三结构”即煤层结构、煤体结构和宏观煤岩类型结构。以沁水盆地SZB区块3号煤层为例,依托27口煤层气参数井煤岩描述和常规测井资料,分别建立了基于测井响应的煤岩“三结构”定量表征方法,形成了一套煤岩品质定量化评价体系。依据煤岩品质评价结果,研究区以Ⅰ类优质煤岩和Ⅱ类良好煤岩为主,主要特征表现为夹矸不发育或者发育较薄,以原生结构煤和碎裂煤为主,光亮煤和半亮煤发育,平面上主要发育在研究区东部和中部;Ⅲ类较差煤岩主要发育在研究区西部。该评价方法不仅可应用于煤层气优质储量和可采性评估,还可以用于指导煤层气井位部署、射孔选层以及排采制度制定等。
In order to solve the problem of coal rock quality evaluation in the process of coalbed methane(CBM)exploration and development,it is systematically sorted out that the key elements of coal rock quality evaluation are“three structures”,namely coal seam structure,coal structure and macrolithotype structure.Taking No.3 coal seam in SZB block of Qinshui basin as an example,the quantitative characterization methods of coal rock“three structures”based on logging response are established respectively by relying on coal rock description and conventional logging data of 27 CBM stratigraphic wells,and a set of quantitative evaluation system of coal rock quality is formed.According to the evaluation results of coal rock quality,the study area is dominated by classⅠhigh-quality coal rocks and classⅡgood coal rocks,which are mainly characterized by undeveloped or thin gangue,mainly primary structural coal and cataclastic coal with bright coal and semi bright coal developed,these coal rocks are mainly developed in the east and middle of the study area on the plane;while classⅢpoor coal rocks are mainly developed in the west of the study area.The evaluation results can not only be applied to the evaluation of high-quality CBM reserves and recoverability,but also guide the deployment of CBM well location,perforation interval selection,and the formulation of drainage and production system.
作者
郭广山
柳迎红
王存武
吕玉民
朱学
申韩刚
GUO Guangshan;LIU Yinghong;WANG Cunwu;LYU Yumin;ZHU Xueshen;HAN Gang(CNOOC Research Institute Ltd.,Beijing 100028,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2022年第2期35-41,共7页
China Offshore Oil and Gas
基金
中国海油科技攻关资助项目“煤层气区块勘探与研究(编号:2020 OT-XNY02)”部分研究成果。
