本文選題：亞地震斷層 + 分形幾何學(xué)　； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：亞地震斷層是指低于地震分辨率的小位移斷層,它們控制了地下流體流動,影響斷塊油氣田地下儲層非均質(zhì)性以及注水開發(fā)效果。定量預(yù)測亞地震斷層的幾何形態(tài)和分布位置對改善油氣田注水開發(fā)效果、提高產(chǎn)能、優(yōu)化井網(wǎng)部署具有重要意義。本文以渤中34-2/4油田II油組為例,提出了亞地震斷層定量預(yù)測的方法,結(jié)合對研究區(qū)注采關(guān)系的分析,討論了亞地震斷層對儲層非均質(zhì)性的影響。首先,對研究區(qū)地震斷層幾何學(xué)特征進(jìn)行分析,劃分?jǐn)嗔严到y(tǒng),利用分形理論對亞地震斷層數(shù)量進(jìn)行預(yù)測,然后對主要斷裂期的古構(gòu)造應(yīng)力場進(jìn)行三維地質(zhì)力學(xué)模擬,模擬地震斷層附近的應(yīng)力擾動作用,結(jié)合庫倫破裂準(zhǔn)則,計算了破裂優(yōu)勢方位和最大剪切應(yīng)力分布,利用隨機(jī)模擬技術(shù),基于自相似性原理,對研究區(qū)亞地震斷層數(shù)量進(jìn)行預(yù)測;運(yùn)用三維地質(zhì)力學(xué)模擬的方法,模擬研究區(qū)活動期最大剪切應(yīng)力和破裂方位,以此為限制條件,對研究區(qū)亞地震斷層進(jìn)行定量預(yù)測。統(tǒng)計分析研究區(qū)注采關(guān)系資料,研究亞地震斷層對注水開發(fā)的影響。得出結(jié)論:(1)利用分形理論和力學(xué)數(shù)值模擬相結(jié)合的方法,可以有效地對亞地震斷層進(jìn)行定量預(yù)測,預(yù)測結(jié)果與解釋的“疑似斷層”吻合度達(dá)90%以上;(2)亞地震斷層和裂縫的存在明顯增強(qiáng)了儲層的非均質(zhì)性;(3)亞地震斷層規(guī)模越大,注采井間受效時間及受效時間與斷距的比值均越大,尤其是當(dāng)亞地震斷層斷距大于6.5m時,注采受效時間明顯變長;(4)斷層附近伴生大量裂縫及規(guī)模較小的亞地震斷層,從而改善儲層的連通性。
[Abstract]:Subseismic faults are small displacement faults with lower resolution of earthquakes. They control the flow of underground fluids and affect the heterogeneity of underground reservoirs in fault block oil and gas fields and the effect of water injection development. Quantitative prediction of the geometry and distribution of subseismic faults is of great significance for improving the effect of oil and gas field water injection development, improving productivity and optimizing well pattern deployment. In this paper, taking the oil group II of 34-2 / 4 oilfield in Bozhong as an example, a method for quantitative prediction of subseismic faults is put forward, and the influence of sub-seismic faults on reservoir heterogeneity is discussed in combination with the analysis of injection-production relationship in the study area. Firstly, the geometrical characteristics of seismic faults in the study area are analyzed, the fault system is divided, the number of subseismic faults is predicted by fractal theory, and then the paleotectonic stress field in the main fault period is simulated by 3D geological mechanics. Based on the Coulomb fracture criterion and the stress disturbance near the seismic fault, the dominant direction of fracture and the maximum shear stress distribution are calculated. Based on the principle of self-similarity, the random simulation technique is used. The number of subseismic faults in the study area is predicted, and the maximum shear stress and fracture azimuth of active period are simulated by using three-dimensional geo-mechanical simulation method, which is taken as the limiting condition to quantitatively predict subseismic faults in the study area. The influence of subseismic fault on water injection development is studied by statistical analysis of injection-production relation data in the study area. It is concluded that the fractal theory combined with the numerical simulation of mechanics can be used to predict subseismic faults quantitatively. The degree of coincidence between the predicted results and the interpreted "suspected faults" is more than 90%.) the existence of subseismic faults and fractures obviously enhances the heterogeneity of reservoirs. The larger the scale of sub-seismic faults is, the larger the size of the sub-seismic faults is. The larger the effective time between injection and production wells and the ratio of effective time to fault distance, especially when the subseismic fault spacing is greater than 6.5 m, the injection-production response time obviously becomes longer. () A large number of fractures and smaller subseismic faults occur near the fault. Thus, the reservoir connectivity is improved.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13;TE357.6

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