【摘要】：儲(chǔ)層中的天然裂縫對(duì)油氣產(chǎn)能有重要影響,但由于井下數(shù)據(jù)有限,僅依靠井下數(shù)據(jù)一般難以確定裂縫系統(tǒng)分布網(wǎng)絡(luò)的非均質(zhì)性,同時(shí)也難以獲取裂縫數(shù)值模擬大量的靜態(tài)參數(shù),因此對(duì)裂縫的定量評(píng)價(jià)面臨著較大挑戰(zhàn)。選取庫(kù)車前陸沖斷帶露頭區(qū)典型構(gòu)造樣式,描述不同構(gòu)造樣式下(即逆沖推覆單斜、高角度逆沖擠壓背斜、基底遮擋滑脫型背斜)獨(dú)特的裂縫發(fā)育分布特征,探討不同構(gòu)造樣式下的裂縫發(fā)育規(guī)律。結(jié)果表明:逆沖推覆單斜發(fā)育2期裂縫,走向主要為北北西向,以晚期近直立開啟縫為主,早期高角度斜交縫被方解石半充填—全充填,裂縫面密度自核部向翼部有降低趨勢(shì);高角度逆沖擠壓背斜總體發(fā)育3期裂縫,以北北西向、北西西向?yàn)橹?早期裂縫基本被方解石完全充填,中晚期裂縫開啟,且切穿單砂體并收斂于層面,具有明顯層控性,背斜的陡翼裂縫較緩翼發(fā)育強(qiáng)烈,呈現(xiàn)出不對(duì)稱的分布規(guī)律;基底遮擋滑脫型背斜被強(qiáng)擠壓一翼發(fā)育2期高角度斜交開啟縫,裂縫方向呈北北西向和北東東向,被遮擋一翼砂巖遭受變形較弱,基本未見明顯裂縫。不同構(gòu)造樣式下的裂縫發(fā)育規(guī)律對(duì)裂縫數(shù)值模擬和有利儲(chǔ)層分布預(yù)測(cè)均具有重要意義。
[Abstract]:Natural fractures in reservoir have an important influence on oil and gas productivity, but because of the limited downhole data, it is generally difficult to determine the heterogeneity of fracture system distribution network by relying only on downhole data, and it is also difficult to obtain a large number of static parameters of fracture numerical simulation, so the quantitative evaluation of fractures is facing great challenges. The typical structural styles in the outcrop area of Kuqa Foreland thrust belt are selected to describe the unique fracture development and distribution characteristics under different structural styles (that is, thrust nappe monoclinic, high angle thrust compression anticlinal, basement occlusion slippage anticlinine), and to explore the law of fracture development under different structural styles. The results show that the thrust nappe monoclinic develops the second stage fracture, the strike is mainly north-west, mainly the late vertical opening joint, the early high angle oblique joint is semi-filled and fully filled by calcite, and the fracture surface density tends to decrease from the core to the wing. There are three stage cracks in the high angle thrust compression anticlinal, mainly in the north west direction and west direction. The early fractures are basically filled with calcite, the cracks are opened in the middle and late stage, and the single sand body is cut through and converges to the plane, which has obvious layer control. The steep wing cracks of anticlinal are stronger than those of slow wing, showing asymmetrical distribution law. The basement occlusive slip anticlinal is strongly squeezed by the first wing to develop two stage high angle oblique open fractures, and the fracture direction is north-west and east-east, and the deformation of blocked one-wing sandstone is weak, and no obvious cracks are found. The law of fracture development under different structural styles is of great significance to the numerical simulation of fractures and the prediction of favorable reservoir distribution.
【作者單位】： 中國(guó)石油天然氣股份有限公司杭州地質(zhì)研究院;中國(guó)石油西南油氣田公司重慶氣礦;
【基金】：國(guó)家“十三五”重大科技專項(xiàng)(編號(hào):2016ZX05003-001)資助
【分類號(hào)】：P618.13

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