地质力学学报
地質力學學報
지질역학학보
JOURNAL OF GEOMECHANICS
2014年
4期
363-371
,共9页
伍亚%戴俊生%顾玉超%商琳%刘强
伍亞%戴俊生%顧玉超%商琳%劉彊
오아%대준생%고옥초%상림%류강
高台子油田%现今地应力%数值模拟%人工压裂缝
高檯子油田%現今地應力%數值模擬%人工壓裂縫
고태자유전%현금지응력%수치모의%인공압렬봉
Gaotaizi oil field%present geo-stress%numerical simulation%artificial fractures
利用微地震资料和岩石波速各向异性实验数据计算统计了高台子油田扶余油层相关井点的现今地应力方向,并通过水力压裂资料及岩心古地磁定向、差应变、声发射实验得到井点的现今地应力数值;结合岩石三轴抗压实验确定扶余油层的岩石力学参数,在此基础上利用ANSYS软件建立研究区的有限元模型,以井点现今地应力参数为约束条件,对扶余油层现今地应力场进行数值模拟,并分析了水力压裂施工时现今应力场及天然裂缝活动性对人工压裂缝的影响。研究结果表明,高台子油田扶余油层水平最大主应力集中在34 MPa附近,呈北东东—南西西向,水平最小主应力为26~30 MPa,方向北北西—南南东。断层带内有较高的应力值,研究区西北部的背斜翼部水平主应力值较大,而东部、南部较为平缓的背斜核部则是水平主应力的低值区。西部的背斜翼部及断裂带是天然裂缝的活跃区域,天然裂缝对压裂缝的延伸方向影响较大;东部的背斜核部平缓地带天然裂缝的活动性较低。
利用微地震資料和巖石波速各嚮異性實驗數據計算統計瞭高檯子油田扶餘油層相關井點的現今地應力方嚮,併通過水力壓裂資料及巖心古地磁定嚮、差應變、聲髮射實驗得到井點的現今地應力數值;結閤巖石三軸抗壓實驗確定扶餘油層的巖石力學參數,在此基礎上利用ANSYS軟件建立研究區的有限元模型,以井點現今地應力參數為約束條件,對扶餘油層現今地應力場進行數值模擬,併分析瞭水力壓裂施工時現今應力場及天然裂縫活動性對人工壓裂縫的影響。研究結果錶明,高檯子油田扶餘油層水平最大主應力集中在34 MPa附近,呈北東東—南西西嚮,水平最小主應力為26~30 MPa,方嚮北北西—南南東。斷層帶內有較高的應力值,研究區西北部的揹斜翼部水平主應力值較大,而東部、南部較為平緩的揹斜覈部則是水平主應力的低值區。西部的揹斜翼部及斷裂帶是天然裂縫的活躍區域,天然裂縫對壓裂縫的延伸方嚮影響較大;東部的揹斜覈部平緩地帶天然裂縫的活動性較低。
이용미지진자료화암석파속각향이성실험수거계산통계료고태자유전부여유층상관정점적현금지응력방향,병통과수력압렬자료급암심고지자정향、차응변、성발사실험득도정점적현금지응력수치;결합암석삼축항압실험학정부여유층적암석역학삼수,재차기출상이용ANSYS연건건립연구구적유한원모형,이정점현금지응력삼수위약속조건,대부여유층현금지응력장진행수치모의,병분석료수력압렬시공시현금응력장급천연렬봉활동성대인공압렬봉적영향。연구결과표명,고태자유전부여유층수평최대주응력집중재34 MPa부근,정북동동—남서서향,수평최소주응력위26~30 MPa,방향북북서—남남동。단층대내유교고적응력치,연구구서북부적배사익부수평주응력치교대,이동부、남부교위평완적배사핵부칙시수평주응력적저치구。서부적배사익부급단렬대시천연렬봉적활약구역,천연렬봉대압렬봉적연신방향영향교대;동부적배사핵부평완지대천연렬봉적활동성교저。
In the research of present geo?stress of Fuyu reservoir in Gaotaizi oilfield, the micro seismic data and the experimental data of rock velocity anisotropy are used to get the directions of present geo?stress of wells. On the other hand, hydraulic fracturing data and rock dynamic experiment including paleomagnetic experiment, differential deformation experiment and acoustic emission experiment are employed to determine the value of present geo?stress of wells. Triaxial rock mechanical test is conducted to get rock mechanics parameters of Fuyu reservoir. On these basis, we have built up the three?dimensional finite element model by ANSYS software, which utilized the present geo?stress parameter of wells as constraint condition to proceed the numerical simulation of present geo?stress of Fuyu reservoir and to analyze the impact on artificial fractures in the fracturing operation created by the activity of natural fracture and present geo?stress. The results prove that the value of maximum horizontal principal stress stays in 34 MPa and its direction is NEE?SWW and the value of Minimum horizontal principal stress varies from 26 MPa to 30 MPa and its direction is NNW?SSE. The stress value in fault zone and anticlinal flanks in the northwest is much higher. However the gentle anticlinal core in the eastern and the southern part are low value zones. The anticlinal flanks and fault zone in the west are the active zones of natural fracture. The direction of artificial fractures are mainly affected by the natural fractures; in the eastern anticlinal core, the activity of natural fracture is lower.