页岩气层内运移机理分析及应用  

Analysis and Application of Gas Migration Mechanism within Shale

作　　者：黄长兵 张峰 李顺平 杨震 张雪锐 胡泊 童守强 HUANG Chang-bing;ZHANG Feng;LI Shun-ping;YANG Zhen;ZHANG Xue-rui;HU Bo;TONG Shou-qiang(Exploration and Development Research Institute of Zhongyuan Oilfield,Zhengzhou 450000,China;Research Institute of Drilling and Production Engineering,PetroChina Yumen Oilfield Company,Jiuquan 735000,China;Zhongzhou Futures Co.,Ltd.,Shanghai 200120,China;Research Institute of Exploration and Development,PetroChina Yumen Oilfield Company,Jiuquan 735000,China)

机构地区：[1]中国石油化工股份有限公司中原油田分公司勘探开发研究院,郑州450000 [2]中国石油玉门油田分公司钻采工程研究院,酒泉735000 [3]中州期货有限公司研究所,上海200120 [4]中国石油玉门油田分公司勘探开发研究院,酒泉735000

出　　处：《科学技术与工程》2020年第17期6752-6759,共8页Science Technology and Engineering

基　　金：国家科技重大专项(2016ZX05017);中石化十条龙项目(P18062-1)。

摘　　要：前人对页岩气运移的研究主要集中于吸附-解吸附规律及其在微纳米孔喉中扩散流动的微观运移规律。页岩气的层内运移也会受到流体势的控制,介于页岩的孔渗特点,流体势的高低取决于孔隙流体压力。根据不同地质环境的孔隙流体压力差异,建立3种页岩气层内运移的理论模型:①褶皱中的层内运移模型;②差异剥蚀引起的层内运移模型;③有机质成熟度差异引起的层内运移模型。微观运移为层内运移提供必要的运移通道,层内运移进一步促进微观运移的过程。在此基础上,对川东地区焦石坝断背斜开展页岩气层内运移机理研究。结果证明,川东地区焦石坝断背斜中,页岩气和孔隙压力分布情况与建立的层内运移模型相一致。通过页岩气的层内运移和微观运移规律研究,更有助于准确地找到油气勘探的“甜点区”。Many researchers studies are mainly focused on the law of shale gas micro-migration in micropore and nanopore and the law of adsorption and desorption.Intra-layer migration of shale gas is also controlled by fluid potential,which is between the characteristics of pore permeability of shale.The level of fluid potential depends on the pore fluid pressure.According to the difference of the pore fluid pressure in different geologic environment,three theoretical models of the gas intra-layer migration mechanism was set up.They were the intra-layer migration model of fold,the model of intra-layer migration caused by different denudation,and the model of intra-layer migration caused by different degree of organic metamorphism.Micro-migration createdthe necessary pathway for intra-layer migration and intra-layer migration couldadvance the process of desorption and liberation.On this basis,the mechanism of shale gas migration in the fault anticline of coke dam in the east of Sichuan was studied.The results show that the distribution of shale gas and pore fluid pressure conforms to the built intra-layer migration mechanism.The research about the intra-layer migration and the micro-migration will help to findthe advantageous exploring target more accurately.

关 键 词：页岩气 运移机理 孔隙流体压力 流体势 焦石坝 

分 类 号：P624[天文地球—地质矿产勘探]