發(fā)布時(shí)間：2019-03-06 15:00

【摘要】：構(gòu)造應(yīng)力場(chǎng)研究對(duì)于塔里木盆地大北氣田的開(kāi)發(fā)具有重要理論與現(xiàn)實(shí)意義。通過(guò)區(qū)域斷裂與背斜長(zhǎng)軸走向、鉆井誘導(dǎo)縫走向與井壁坍塌方位分別確定了古、今構(gòu)造應(yīng)力場(chǎng)的方向,采用測(cè)井資料計(jì)算了古、今構(gòu)造應(yīng)力場(chǎng)的大小。在此基礎(chǔ)上,利用ANSYS有限元分析軟件建立了大北氣田主體氣藏區(qū)大北102區(qū)塊和大北201區(qū)塊的地質(zhì)模型,并通過(guò)測(cè)井資料計(jì)算及動(dòng)靜態(tài)轉(zhuǎn)換確定巖石力學(xué)參數(shù),利用構(gòu)造應(yīng)力場(chǎng)解析結(jié)果確定邊界條件,進(jìn)行了大北氣田古今構(gòu)造應(yīng)力場(chǎng)的數(shù)值模擬,分析了構(gòu)造應(yīng)力場(chǎng)的分布規(guī)律以及構(gòu)造應(yīng)力場(chǎng)與構(gòu)造裂縫和產(chǎn)能的關(guān)系。結(jié)果表明:大北氣田古、今水平最大主應(yīng)力方向分別約NNW336°和NWW305°,應(yīng)力大小分別具有σHσhσv和σHσvσh的特征,分別屬于Ⅱ類(lèi)和Ⅲ類(lèi)地應(yīng)力;主應(yīng)力和主差應(yīng)力在平面上表現(xiàn)為背斜高部位為低值、翼部為高值,縱向上隨深度增加而增大;構(gòu)造裂縫的走向受控于水平最大古構(gòu)造應(yīng)力方向,與現(xiàn)今水平最大主應(yīng)力方向近似平行或呈小角度相交,構(gòu)造裂縫可沿走向繼續(xù)延伸,開(kāi)度也不會(huì)因構(gòu)造擠壓作用大幅降低,有效性可得到很好的保存,氣藏區(qū)構(gòu)造裂縫發(fā)育程度與主差應(yīng)力的大小呈正相關(guān)關(guān)系;背斜高點(diǎn)是構(gòu)造應(yīng)力的低值區(qū),油氣在應(yīng)力勢(shì)差和浮力的共同驅(qū)動(dòng)下聚集成藏,其中主差應(yīng)力較大的井點(diǎn)構(gòu)造裂縫較發(fā)育,無(wú)阻流量較高,因此在背斜高點(diǎn)主差應(yīng)力較大的區(qū)域部署井位,有較大概率獲得天然氣的高產(chǎn)。
[Abstract]:The study of tectonic stress field is of great theoretical and practical significance for the development of Dabei gas field in Tarim Basin. The direction of paleo-and present-day tectonic stress field is determined by regional fault and anticline long-axis strike, drilling-induced fracture strike and wellbore collapse orientation, and the magnitude of paleo-and present-day tectonic stress field is calculated by using logging data. On this basis, the geological models of Dabei 102 block and Dabei 201 block in the main gas reservoir area of Dabei gas field are established by using ANSYS finite element analysis software, and the rock mechanics parameters are determined by logging data calculation and dynamic and static transformation. The numerical simulation of the ancient and modern tectonic stress field in Dabei gas field is carried out by using the analytical results of the tectonic stress field to determine the boundary conditions. The distribution of the tectonic stress field and the relationship between the tectonic stress field and the tectonic fracture and productivity are analyzed. The results show that the direction of the maximum principal stress at present level is about NNW336 擄and NWW305 擄, respectively, and the stress is characterized by 蟽 H 蟽 h 蟽 v and 蟽 H 蟽 v 蟽 h, respectively, belonging to type 鈪，

本文編號(hào)：2435631