【摘要】：相同擠壓背景下的相鄰井區(qū),由于區(qū)域應(yīng)力的差異,造成了構(gòu)造形態(tài)的不同,而構(gòu)造形態(tài)又影響了地應(yīng)力的分布�？死K構(gòu)造帶儲集層白堊系巴什基奇克組儲層非均質(zhì)性強,構(gòu)造位置間產(chǎn)量差異大,研究表明儲層除了受沉積相控制外,地應(yīng)力的大小及方向?qū)拥挠绊戄^大�；跀D壓的應(yīng)力環(huán)境將克拉蘇構(gòu)造帶自北向南以克拉蘇斷裂為界分為斜向擠壓區(qū)及水平擠壓區(qū)。斜向擠壓區(qū)的水平擠壓應(yīng)力、水平應(yīng)力差、垂向應(yīng)力較水平擠壓應(yīng)力區(qū)小。為了進一步驗證測量應(yīng)力值的準確性,利用離散元數(shù)值模擬的方法,以地震解釋模型為基礎(chǔ),以實鉆資料為約束,對構(gòu)造演化過程中的斷裂發(fā)育及應(yīng)力、應(yīng)變的分布特征進行了研究。模擬結(jié)果表明,水平擠壓區(qū)與斜向擠壓區(qū)的垂直應(yīng)力相差較小,但水平擠壓區(qū)的水平擠壓應(yīng)力較強,高出斜向擠壓區(qū)30%~50%。強水平擠壓應(yīng)力對儲層的影響具體體現(xiàn)在:儲集層物性、儲集空間、裂縫發(fā)育程度。代表斜向擠壓區(qū)的克拉段,水平擠壓應(yīng)力小,儲集層物性高,溶蝕現(xiàn)象顯著,儲集空間以原生孔隙為主,裂縫欠發(fā)育;水平擠壓區(qū)的克深段,儲集空間以粒間溶蝕擴大孔,粒內(nèi)溶孔為主,儲集層孔隙度低,巖性致密,裂縫極其發(fā)育,從微觀薄片、巖心、FMI成像、微地震檢測上均能發(fā)現(xiàn)大量規(guī)模性的裂縫,規(guī)模性裂縫極大地增強了克深段的儲層連通性,提高了儲集層滲流能力,保證了其在超過6000 m高應(yīng)力儲集層中仍存在日產(chǎn)百萬方天然氣的穩(wěn)產(chǎn)高產(chǎn)井。
[Abstract]:Because of the difference of regional stress, the adjacent well areas under the same extrusion background have different structural forms, which in turn affect the distribution of in-situ stresses. The reservoir of the Cretaceous Bashiqike formation in the Klassou structural belt has strong heterogeneity and great difference in production between structural locations. The study shows that the reservoir is not only controlled by sedimentary facies, but also influenced greatly by the magnitude and direction of in-situ stress. Based on the stress environment of extrusion, the Klassou structural belt is divided into oblique compression zone and horizontal compression zone from north to south with Klassou fault as the boundary. The horizontal extrusion stress, the difference of horizontal stress, and the vertical stress in oblique extrusion region are smaller than those in horizontal extrusion stress region. In order to further verify the accuracy of the measured stress values, using discrete element numerical simulation method, based on the seismic interpretation model and taking the real drilling data as the constraint, the fault development and stress in the process of tectonic evolution are studied. The distribution characteristics of strain were studied. The simulation results show that the vertical stress in the horizontal extrusion region is smaller than that in the oblique extrusion zone, but the horizontal extrusion stress in the horizontal extrusion region is stronger than that in the oblique extrusion zone. The influence of strong horizontal extrusion stress on reservoir is embodied in: reservoir physical property, reservoir space and fracture development degree. The horizontal compression stress is small, the physical property of reservoir is high, the corrosion phenomenon is obvious, the reservoir space is dominated by primary pore and the fracture is underdeveloped, and the reservoir space in horizontal compression zone is enlarged by intergranular dissolution. The porosity of reservoir is low, the lithology is dense, and the fracture is extremely developed. A large number of large scale fractures can be found from micro slice, FMI imaging of core and microseismic detection. The scale fracture greatly enhances the reservoir connectivity of the Keshan formation, improves the percolation ability of the reservoir, and ensures that there are still stable and high production wells with millions of natural gas per day in more than 6000 m high stress reservoirs.
【作者單位】： 中國石油天然氣股份有限公司塔里木油田分公司勘探開發(fā)研究院;南京大學(xué)地球科學(xué)與工程學(xué)院;
【基金】：國家重大專項(2016ZX05003-004) 中國石油天然氣股份公司專項(2014E-2101) 國家自然科學(xué)基金項目(41272227;41572187)
【分類號】：P618.13

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