构造抬升对高低煤阶煤层气藏储集层物性的影响.PDF

　　　　　　　　 　2007 8 　　　　　 　　　PET ROLEUM EXPLORAT ION A ND DEVELOP MENT 　　　　　 　　Vol.34 　No.4 461 :1000-0747 (2007)04-046 1-04 、 1, 2 2 2 3 陈振宏 , 贾承造, 宋岩 , 王红岩 (1.中国科学院广州地球化学研究所;2.中国石油勘探开发研究院;3.中国石油勘探开发研究院廊坊 院) :国家“973”重点基础研究规划项目“煤层气成藏机制及经济开采基础研究”(2002CB211705) :构造抬升对高、低煤阶煤层气藏储集层物性的影响具有显著差异。 低煤阶煤层主要为基质型孔隙, 高煤阶煤层主要 为裂隙型孔隙。 煤岩储集层原地受力 析表明, 构造抬升使得基质承受的压力降低。 构造抬升模拟实验及煤基质、裂隙 渗透率应力敏感性实验表明, 构造抬升后煤层压力传导加速, 割理开启, 渗透率变大;基质渗透率比裂隙渗透率的应力敏 感性弱。 析认为:构造抬升对高煤阶煤储集层物性影响明显, 地层压力降低, 割理、裂缝开启, 裂隙渗透率显著增强;高 煤阶煤层强烈抬升会使其渗透率增大, 造成气体大量散失, 对煤层气聚集不利;低煤阶煤层储集层物性受构造抬升影响较 弱, 由于构造抬升, 压力降低, 煤层气运移速率增大, 对煤层气开采有利。 图4 参19 :煤层气;高煤阶;低煤阶;构造抬升; 集层物性;渗透率 :T E122.2 　　　:A Effects of tectonic uplift on physical properties of high and low rank coal reservoirs 1, 2 2 2 3 CHEN Zhen-hong , JIA Cheng-zao , SONG Yan , WANG Hong- an (1.Guangz hou Institute of Geochemistry, CAS, Guangz hou 510640, China;2.Research Institute of Petroleum Exp loration Develop ment, PetroChina, Beij ing 100083, China;3.angf ang B ranch of Research Institute of Petroleum Exp loration Develop ment, PetroChina, angf ang 065007, China) Abstract:The inf luences of tectonic uplif t on the ph sical properties of high and low rank coal-bed methane (CBM ) reservoirs are different.Low rank coal-beds have mainl matrix-t pe pores and high rank coal-beds are mainl cleat t pe. The stress anal sis of coal reservoirs indicate that the matrix pressure decreases w ith the tectonic uplif t.The uplif t simulation and the sensitivit experiment of the matrix and cleat permeabilit show that tectonic uplift makes the coal seams pressure deliver faster, cleats open, an