【摘要】：白云凹陷是南海北部深水區(qū)已證實的地質(zhì)條件最優(yōu)越的富生烴凹陷,但前人對白云凹陷的研究在構(gòu)造、沉積和成因機制上存在爭議。近年來采集的高品質(zhì)地震資料有效提高了白云凹陷地震反射界面識別、結(jié)構(gòu)特征、沉積充填和構(gòu)造演化研究的可靠性。選取白云凹陷為研究對象,將均勻巖石圈塑性變形的伸展拆離作用應(yīng)用于白云凹陷的構(gòu)造解析,在地震資料解釋基礎(chǔ)上,以拆離斷層的厘定、理論模型與動力學分析為主要工作思路,進而闡明構(gòu)造演化及其油氣地質(zhì)意義。白云凹陷11條控洼斷層可厘定為拆離斷層系,剖面上表現(xiàn)為多期正斷層呈鏟狀,向下合并為一條大規(guī)模低角度正斷層,晚期被差異抬升作用改造的特征;平面上具有波瓦狀構(gòu)造特征。拆離作用控制了白云凹陷的構(gòu)造演化和沉積充填,白云凹陷經(jīng)歷拆離斷陷期、斷拗復(fù)合期和區(qū)域沉降期3個階段構(gòu)造演化;拆離作用及其之后的持續(xù)性區(qū)域沉降作用,使白云凹陷成為南海北部深水區(qū)面積最大、沉積最厚的凹陷;同時也控制了文昌組和恩平組主要烴源巖的分布和演化。
[Abstract]:Baiyun Sag is the most favorable hydrocarbon generating sag in the deep water area of the northern South China Sea, but the previous researches on Baiyun Sag are controversial in terms of structure, sedimentation and genetic mechanism. The high quality seismic data collected in recent years have effectively improved the reliability of seismic reflection interface identification, structural characteristics, sedimentary filling and structural evolution in Baiyun sag. Taking Baiyun sag as the research object, the extension and detachment of plastic deformation of homogeneous lithosphere is applied to the structural analysis of Baiyun sag. On the basis of seismic data interpretation, the determination of detachment fault is carried out. The theoretical model and dynamic analysis are the main working ideas, and then clarify the tectonic evolution and its significance in oil and gas geology. The plane has the characteristic of wave-tile structure. The structural evolution and depositional filling of Baiyun sag are controlled by the detachment process. The structural evolution of Baiyun sag has experienced three stages: the detachment fault depression period, the fault depression composite period and the regional subsidence stage, and the detachment process and its continuous regional subsidence. Baiyun sag is the largest deep water area and thickest sedimentary depression in the northern South China Sea and controls the distribution and evolution of the main hydrocarbon source rocks of Wenchang formation and Enping formation.
【作者單位】： 中海油研究總院;
【基金】：國家自然科學基金(編號:91528303) 國家重大科技專項(編號:2016ZX05026007) 南海北部深水區(qū)天然氣資源戰(zhàn)略調(diào)查及評價項目(編號:XQ-2004-05;XQ-2007-05)聯(lián)合資助
【分類號】：P618.13

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