沁水盆地寿阳区块煤层气井产水差异性原因分析及有利区预测

发布时间：2018-01-14 02:12

本文关键词：沁水盆地寿阳区块煤层气井产水差异性原因分析及有利区预测　出处：《天然气工业》2016年08期 　论文类型：期刊论文

【摘要】：沁水盆地寿阳区块多数煤层气井在排采过程中呈现出"高产水、低产气"的特点,较高的产水量严重制约了煤层气单井产能。为此,基于该区64口煤层气井的排采动态资料和相关的地质、钻井及压裂资料,从断裂构造、压裂缝类型和煤层顶底板岩性组合三方面综合分析了煤层气井产水差异性的原因,并据此提出了"避水采气"层次分析方法,预测了该区"避水采气"的有利区。研究认为,该区煤层气井产水差异性主要存在两大原因:(1)部分煤层气井位于断层附近,断层沟通了煤层顶底板的砂岩含水层,导致单井产水量较高;(2)区域地应力类型决定了该区煤层在压裂过程中会产生垂直压裂缝,其压穿岩性组合类型较差的煤层顶底板,从而沟通含水层导致单井产水量较高。结论认为:(1)煤层气生产过程中应进行"避水采气"有利区预测,其层次分析步骤为"一看断裂构造,二看应力类型,三看岩性组合";(2)该区块西部、东北部和中北部为煤层气开发的"避水采气"有利区。
[Abstract]:Most coalbed gas wells in Shouyang block of Qinshui Basin show the characteristics of "high water production and low gas production" in the process of production. The high water production seriously restricts the productivity of single coalbed methane wells. Based on the recovery performance data of 64 coalbed gas wells in this area and related geological, drilling and fracturing data, the fault structure is obtained. The reasons for the difference of water production in coalbed gas wells are analyzed from three aspects: the type of pressure fracture and the lithology combination of coal seam roof and floor, and the analytic hierarchy process (AHP) method of "avoiding water and producing gas" is put forward. This paper predicts the favorable area of "avoiding water and producing gas" in this area. The study shows that there are two main reasons for the difference of water production of coalbed gas wells in this area: 1) part of the wells are located near faults. The fault communicates the sandstone aquifer of the top and bottom of coal seam, which results in high water production of single well. 2) the type of regional in-situ stress determines that the coal seam in this area will produce vertical fracture in the process of fracturing, and the roof and floor of coal seam with poor combination type of lithology will be pressed through. The conclusion is that the favorable area of "water escape and gas recovery" should be predicted in the process of coalbed methane production, and the analytic hierarchy process is "one look at the fault structure". Two look at the stress type, three look at the lithologic combination "; The west, northeast and central north of the block are favorable areas for coalbed methane exploitation.
【作者单位】：中国石油大学(北京)地球科学学院;油气资源与探测国家重点实验室;中海石油(中国)有限公司非常规油气分公司;中联煤层气有限责任公司;
【基金】：国家科技重大专项“深煤层煤层气开发技术研究及装备研制”(编号:2011ZX05042)
【分类号】：TE37
【正文快照】： 1.中国石油大学(北京)地球科学学院2.油气资源与探测国家重点实验室3.中海石油(中国)有限公司非常规油气分公司4.中联煤层气有限责任公司王金等.沁水盆地寿阳区块煤层气井产水差异性原因分析及有利区预测.天然气工业,2016,36(8):52-59.摘要沁水盆地寿阳区块多数煤层气井在排采

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