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Coalbed Methane Potential Evaluation and Development Sweet Spot Prediction Based on the Analysis of Development Geological Conditions in Yangjiapo Block, Eastern Ordos Basin, China
Geofluids ( IF 1.7 ) Pub Date : 2021-09-25 , DOI: 10.1155/2021/8728005
Xinyu Fu 1, 2 , Yanjun Meng 1, 2 , Zhongcheng Li 3 , Peng Kong 3 , Suoliang Chang 1, 2 , Taotao Yan 1, 2 , Yanfei Liu 1, 2
Affiliation  

The evaluation and prediction of favorable coalbed methane (CBM) sweet spot play an important role in well location deployment and recovery prediction in CBM blocks. This work investigates the CBM geology and accumulation characteristics of No. () coal in the Carboniferous Taiyuan Formation in Yangjiapo block based on data from 14 CBM wells. The desorption index is proposed to be used to study the CBM desorption potential in Yangjiapo block, and the parameter of reduced water level is adopted to study the CBM hydrodynamics of the block. Furthermore, the analytical hierarchy fuzzy evaluation method is used to evaluate and prediction the CBM development sweet spot in Yangjiapo block. The results show that the buried depth of the No. () coal seam in Yangjiapo block varies from 693.20 to 1213.20 m, the coal thickness is from 5.40 to 13.10 m, the gas content is from 5.89 to 10.55 m3/t, and the minimum horizontal principal stress is from 9.80 to 20.82 MPa. The desorption potential is better in the southeastern and central-western part of the block. It is found that there is a positive relationship between CBM content and hydrodynamics and indicated that CBM easily concentrates in the lower reduced water level area. The CBM favorable development sweet spot is forecasted to be located in the southeastern part, central-western region, and northeastern part of Yangjiapo block.

中文翻译:

基于开发地质条件分析的鄂尔多斯盆地东部杨家坡区块煤层气潜力评价及开发甜点预测

有利煤层气(CBM)甜蜜点的评价和预测对煤层气区块的井位部署和采收率预测具有重要作用。这项工作调查了()杨家坡区块石炭系太原组煤,基于 14 口煤层气井资料。提出采用解吸指数研究杨家坡区块煤层气解吸潜力,采用降低水位参数研究该区块煤层气水动力。进一步采用层次分析模糊评价方法对杨家坡区块煤层气开发甜点进行评价和预测。结果表明,No. ()杨家坡区块煤层693.20~1213.20 m,煤厚5.40~13.10 m,含气量5.89~10.55 m 3 /t,最小水平主应力9.80~20.82 MPa。块体东南部和中西部的解吸潜力较好。发现煤层气含量与水动力之间存在正相关关系,表明煤层气容易聚集在低水位区。预计煤层气有利开发甜点区位于杨家坡区块东南部、中西部和东北部。
更新日期:2021-09-27
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