CAJ | 학술논문

开展储层裂缝预测研究,首先必须认识构造裂缝形成的期次及其古应力状态.通过上三叠统延长组长61储层岩石声发射实验得出的古构造历史有效最大主应力记忆出现率,厘定鄂尔多斯盆地沿河湾探区长61储层构造裂缝形成时最大主应力介于79.12～89.99 MPa之间.通过岩石古应力分期、裂缝充填物包裹体测温和期次测定,结合区域构造应力场演化分析,确定延长组储层构造裂缝主要形成期为燕山期.通过露头区地层和覆盖区定向岩心共轭裂缝或节理应变测量,恢复了沿河湾地区燕山期构造运动三轴应力状态,即最大主应力(δ_1)方向为NW-SE向,优势方位129°∠10°,最小主应力(δ_3)优势方位36°∠7°,中间主应力(δ_2)近于垂直.裂缝主要形成期及其古应力状态研究成果为沿河湾探区长61低渗储层构造裂缝分布和发育规律定量预测研究提供了地质依据.
개전저층렬봉예측연구,수선필수인식구조렬봉형성적기차급기고응력상태.통과상삼첩통연장조장61저층암석성발사실험득출적고구조역사유효최대주응력기억출현솔,전정악이다사분지연하만탐구장61저층구조렬봉형성시최대주응력개우79.12～89.99 MPa지간.통과암석고응력분기、렬봉충전물포과체측온화기차측정,결합구역구조응력장연화분석,학정연장조저층구조렬봉주요형성기위연산기.통과로두구지층화복개구정향암심공액렬봉혹절리응변측량,회복료연하만지구연산기구조운동삼축응력상태,즉최대주응력(δ_1)방향위NW-SE향,우세방위129°∠10°,최소주응력(δ_3)우세방위36°∠7°,중간주응력(δ_2)근우수직.렬봉주요형성기급기고응력상태연구성과위연하만탐구장61저삼저층구조렬봉분포화발육규률정량예측연구제공료지질의거.
It must be definitely replied to the forming time of tectonic fracture in reservoirs and the state of palaeostress in estimating and predicting work. According to the method of acoustic emission (AE) palaeostress measurement, the effective percentage of the maximum principal stress can be concluded in the history of palaeo-structure.The AE measurements reveal that the corresponding maximum principal stress is in the range of 80 to 98 MPa in Chang 6_1 low permeable reservoir of Upper Triassic in Yanhewan area, Ordos Basin.Based on the result of palaeostress stage,the thermometry measurement of fracture filling inclusion and the evolution characteristics of regional stress field, it can be confirmed that the tectonic fractures form at Yanshanian movement.By the measurement of the strain of the conjugated fissures located in the outcrop area or the overlay area, the triaxial stress state in Yanshanian is resumed in this area.The direction of the maximum principal stress is NW-SE direction, predominant direction is 129°∠10°, the predominant direction of the minimum principal stress is 36°∠7°, the intermediate principal stress is approximate vertical.Those results can provide some references for prediction of tectonic fracture in low permeability reservoirs.