摘要
河南焦作煤层气区块山西组二1煤储层厚度大且含气量高,煤层气资源丰富,但煤层气勘探效果不佳。2022年西部斜坡带和中部鼻状构造带缓坡参数井均取得产量突破。针对构造与沉积特征、煤储层含气特征、煤体结构及渗透率规律这三方面,通过断裂与构造刻画、煤层气勘探有利区分割机制和产气归因性分析等研究,取得了新认识。研究认为:①多期次构造演化形成阶梯状断块分布的构造形态,导致煤层埋藏深度存在较大差异;②受构造强烈挤压、揉搓形成的构造煤储层是煤层气井产气效果不佳的重要不利因素;③在断裂构造弱影响区优选含气条件与煤体结构双优储层,有利于确保增产改造效果从而实现气井高产。新参数井的钻探成功,实现了焦作区块中深煤层勘探领域性突破,对盘活焦作区块以及后期滚动勘探提储具有重要指导意义。
In Jiaozuo coalbed methane exploration block of Henan province,the coal seamⅡ1 of Shanxi Formation has the characteristics of large thickness and high gas content.The parameter wells of coalbed methane,drilled and drained at western slope zone and gentle slope of central nose shaped structural zone,have achieved a breakthrough in production in the year of 2022.Even possessing abundant coalbed methane resources,no breakthrough on coalbed methane exploration has been achieved yet.Through the study on structural evolution and faults,reservoir separation mechanisms of favorable coalbed methane exploration area and gas production attribution analysis,the following new understandings have been gained in terms of structural and sedimentary characteristics,gas bearing characteristics of coal reservoirs and coal structure and permeability law:①The multiple tectonic revolutions lead to structural morphology of stepped fault block distribution,which results in significant differences in the burial depth of coal seam;②The tectonic coal reservoir formed by the strong compression and kneading of the structure is an important adverse factor for the poor gas production of coalbed methane wells;③Focusing on reservoirs with optimized gas bearing conditions and coal body structure in the weakly affected area of fault structures is profit to ensure the effectiveness of stimulation and transformation and the high production of gas wells.Successful drilling of new parameter wells realizes the overshoot in the exploration of medium-deep coal seams in Jiaozuo block and has important guiding significance for revitalizing the block,rolling exploration and improving reserves in the later stage.
作者
赖文奇
王存武
陈思路
刘芬
田永净
LAI Wenqi;WANG Cunwu;CHEN Silu;LIU Fen;TIAN Yongjing(CNOOC Research Institute Ltd.,Beijing 100028,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2023年第6期60-69,共10页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司七年行动计划“煤层气增储上产技术研究(编号:CNOOC-KJ135ZDXM40 ZL01)”
中国海洋石油集团公司“十四五”重大科技项目“煤层气地质工程关键参数表征及甜点区评价技术(编号:KJGG-2022-1001)”部分研究成果。
关键词
焦作区块
煤储层
煤层气
煤体结构
二1煤
Jiaozuo block
coal reservoir
coalbed methane
coal structure
coal seamⅡ1
