【摘要】：本文主要對(duì)松遼盆地三肇凹陷青山口組泥巖底界面(T2反射層)和頂界面(T11反射層)的斷層幾何學(xué)特征進(jìn)行了對(duì)比分析,在此基礎(chǔ)上對(duì)該地區(qū)的斷層的運(yùn)動(dòng)學(xué)特征及其成因機(jī)制進(jìn)行了系統(tǒng)的解析,認(rèn)為其構(gòu)造成因是T2反射層的高密度斷層。在青山口組沉積時(shí)期早期由于近東西向拉張應(yīng)力場(chǎng)作用,在青山口組塑性泥巖底界面(T2反射層)形成了受斜向裂陷作用、差異伸展作用、基底斷裂及火山口的聯(lián)合控制的多條不同延伸方位的斷裂密集帶。T11反射層斷裂密集帶依然發(fā)育,展布特征與T2斷裂系一致,表明斷裂形成時(shí)受T2斷裂影響較大,但兩者之間并不是一條斷裂的簡(jiǎn)單繼承性生長(zhǎng)的結(jié)果,而是垂向分段生長(zhǎng)連接的結(jié)果。野外觀察、典型地震解剖和物理模擬證實(shí),只要巖石存在能干性差,斷層具有典型垂向分段生長(zhǎng)特征。巖石能干性差異決定斷層演化歷經(jīng)三個(gè)階段:下部斷層形成、斷裂上下分段和貫通性斷裂形成。通過(guò)徐家圍子向斜區(qū)斷裂重新解釋,應(yīng)用巖石力學(xué)特征和斷層相關(guān)褶皺理論,明確了斷裂垂向分段生長(zhǎng)的特征,雖然T11斷裂與T2斷裂雖然分段生長(zhǎng),相互連接性差,但是其發(fā)育受T2斷裂系的影響較大,應(yīng)力的傳遞通常是通過(guò)兩斷層系疊覆的巖橋區(qū)實(shí)現(xiàn)的。通常斷層垂向疊覆的方式有兩種類(lèi)型:限制型疊覆帶和釋放型疊覆帶。三肇凹陷T11與T2斷裂系的疊覆類(lèi)型以限制型疊覆為主,疊覆部位地層通常發(fā)生褶皺或旋轉(zhuǎn)。結(jié)合斷裂的幾何發(fā)育及生長(zhǎng)演化特征,依據(jù)成藏期斷裂的活動(dòng)性和溝通源儲(chǔ)情況,對(duì)研究區(qū)油源斷裂進(jìn)行重新厘定。利用工區(qū)探評(píng)井的生產(chǎn)數(shù)據(jù),以松遼盆地升西—徐家圍子向斜葡萄花油層為解剖對(duì)象,通過(guò)對(duì)研究區(qū)葡萄花油層油水的分布規(guī)律及其與斷裂的關(guān)系的解析,明確了研究區(qū)內(nèi)斷裂對(duì)油水分布的控制作用。研究區(qū)油水分布主要受斷裂密集帶控制,油平面上受斷層密集帶背形構(gòu)造控制呈”條帶狀”分布,垂向上受沉積演化序列和微相物性差異影響”擇層”分布。油井多分布在密集帶內(nèi)兩條斷裂的交叉點(diǎn)處和密集帶的交叉點(diǎn)處,換句話(huà)來(lái)說(shuō),密集帶控油的根本就是斷裂或斷裂帶的交叉點(diǎn)控制油藏的分布。而研究區(qū)北部的宋芳屯、升平等油田由于斷層多期活動(dòng),加之油源供給不足在縱向上呈現(xiàn)下水上油的分布模式。
[Abstract]:In this paper, the fault geometries of the bottom interface of mudstone (T2 reflection layer) and top interface (T11 reflection layer) of Qingshankou formation in Sanzhao depression of Songliao Basin are compared and analyzed. On this basis, the kinematic characteristics and genetic mechanism of the faults in this area are systematically analyzed, and the tectonic origin is considered to be the high-density fault of the T2 reflection layer. In the early sedimentary period of Qingshankou formation, due to the near east-west tensile stress field, the ductile mudstone bottom interface (T2 reflection layer) of Qingshankou formation was subjected to oblique fissure and differential extension. There are several fault-dense zones controlled by basement faults and crater with different extension azimuth. T11 reflection layer fault dense zone is still developed, and the distribution characteristics are consistent with T2 fault system, indicating that the fault formation is greatly affected by T2 fault. But it is not the result of the simple succession growth of a fracture, but the result of vertical piecewise growth. Field observation, typical seismic anatomy and physical simulation confirm that the fault has typical vertical segmental growth characteristics as long as there is poor capability of rock. The difference of rock capability determines that the fault evolution goes through three stages: the formation of the lower fault, the formation of the upper and lower sections of the fault and the formation of the penetrating fault. Through the reinterpretation of the faults in the Xujiaweizi syncline, the vertical sectional growth characteristics of the faults are determined by applying the rock mechanics characteristics and the fault-related fold theory, although the T11 and T2 faults grow in stages, their interconnectedness is poor. However, its development is greatly affected by T2 fault system, and the stress transfer is usually achieved through the rock bridge area overlaid by the two fault systems. There are usually two types of fault vertical overlay: restricted overlay and release overlay. The overlay types of T11 and T2 fault systems in Sanzhao depression are mainly restricted overlay, where the strata usually fold or rotate. Combined with the geometric development and growth evolution of the faults, the oil-source faults in the study area were redetermined according to the activity of the faults during the reservoir forming period and the source storage. Based on the production data of exploratory wells in Songliao Basin, this paper analyzes the distribution of oil and water and its relationship with faults in the Xixi-Xujiaweizi syncline of the Songliao Basin. The controlling effect of faults on the distribution of oil and water in the study area is clarified. The distribution of oil and water in the study area is mainly controlled by the fault dense zone, the oil plane is controlled by the back structure of the fault dense belt, and the vertical distribution is influenced by the sedimentary evolution sequence and the difference of the microfacies physical properties. The oil wells are mostly distributed at the intersection of two faults in the dense zone and the intersection of the dense zone. In other words, the basic of the oil control in the dense belt is the distribution of the reservoir controlled by the crossing point of the fault or fault zone. The oil fields of Songfangtun and Shengping in the north of the study area show the distribution pattern of oil in water longitudinally due to the multi-stage activity of faults and the insufficient supply of oil source.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.13

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本文編號(hào)：2306486