【摘要】：川東北地區(qū)大地構(gòu)造位置為上揚(yáng)子板塊西北緣,位于大巴山弧形褶皺帶和川東北東向褶皺帶的交匯區(qū),經(jīng)歷了多期次復(fù)雜的構(gòu)造運(yùn)動(dòng),形成大量逆沖斷層以及發(fā)育著大量的典型擠壓構(gòu)造�，F(xiàn)今構(gòu)造特征復(fù)雜、構(gòu)造形跡多樣。本文以地震勘探原理、構(gòu)造地質(zhì)學(xué)、石油地質(zhì)學(xué)等多學(xué)科理論為指導(dǎo),結(jié)合地質(zhì)、鉆井取心、地震資料及各種分析化驗(yàn)數(shù)據(jù)等資料,以研究區(qū)飛仙關(guān)組地層的主要構(gòu)造特征,構(gòu)造演化史及成藏特征為核心進(jìn)行研究,取得如下認(rèn)識(shí)： (1)研究區(qū)經(jīng)歷了加里東—海西、印支、燕山與喜山等構(gòu)造運(yùn)動(dòng),其中印支運(yùn)動(dòng)、燕山運(yùn)動(dòng)與喜山運(yùn)動(dòng)對(duì)研究區(qū)構(gòu)造形成的作用最大,現(xiàn)今構(gòu)造格局是多期次的構(gòu)造疊加改造的產(chǎn)物。 (2)研究區(qū)處于兩個(gè)褶皺帶交匯處,地表及地腹構(gòu)造關(guān)系復(fù)雜,構(gòu)造形跡多樣。區(qū)內(nèi)主要發(fā)育北西向和北東向兩組不同方向的構(gòu)造體系,兩個(gè)方向構(gòu)造在特征上表現(xiàn)為：北西向構(gòu)造地表與地腹構(gòu)造具有較好的一致性,僅僅是構(gòu)造幅度及強(qiáng)度有一定差別：但北東向構(gòu)造帶地表與地腹深層構(gòu)造一致性較差,地腹構(gòu)造表現(xiàn)為形態(tài)復(fù)雜、斷裂發(fā)育。 (3)研究區(qū)構(gòu)造應(yīng)力場(chǎng)主要為擠壓應(yīng)力場(chǎng),形成褶皺、斷彎褶皺、斷展褶皺、疊瓦狀斷層及雙向逆沖斷層等構(gòu)造樣式。 (4)川東北構(gòu)造經(jīng)歷了多期構(gòu)造運(yùn)動(dòng),演化時(shí)間長(zhǎng),現(xiàn)今北東向和北西向構(gòu)造是經(jīng)歷了多期發(fā)展演化而形成的,研究表明：北東向構(gòu)造在印支期已具雛形,并最終定型于喜山早期：而北西向構(gòu)造則開(kāi)始形成于燕山晚期,最終定型于喜山晚期。 (5)構(gòu)造演化及構(gòu)造格局與油氣聚集有著密切的關(guān)系,川東北地區(qū)北東向構(gòu)造成藏條件明顯優(yōu)于北西向構(gòu)造,從構(gòu)造發(fā)育史的角度分析,是因?yàn)楸睎|向構(gòu)造在印支期已具雛形,在燕山中期已經(jīng)形成,時(shí)間上與區(qū)內(nèi)的生烴高峰期匹配,北東向構(gòu)造的展布格局呈現(xiàn)構(gòu)造軸線(xiàn)與斷裂走向與油氣主要運(yùn)移方向一致,具有良好的捕獲油氣的條件,而北西向構(gòu)造形成于燕山晚期,與成烴高峰期不匹配,錯(cuò)過(guò)了油氣成藏的最好時(shí)機(jī)。目前的勘探實(shí)踐也證明北東向構(gòu)造(羅家寨構(gòu)造為代表)油氣資源好于北西向構(gòu)造(金珠坪構(gòu)造為代表)。
[Abstract]:The tectonic position of northeast Sichuan is the northwestern margin of upper Yangtze plate, which is located at the intersection of the Dabashan arc fold belt and the northeast Sichuan east-trending fold belt, and has undergone many complex tectonic movements. A large number of thrust faults and a large number of typical compression structures are formed. At present, the structural features are complex and the structural traces are diverse. Guided by the principles of seismic exploration, structural geology, petroleum geology and other multi-disciplinary theories, combined with the data of geology, drilling coring, seismic data and various analytical and laboratory data, this paper studies the main structural characteristics of the formation of the Feixianguan formation in the area. The structural evolution history and the characteristics of reservoir formation were studied as follows: (1) the study area experienced Caledon-Hercynian, Indosinian, Yanshan and Himalayan tectonic movements, among which the Indosinian movement. The Yanshanian movement and the Himalayan movement play the most important role in the tectonic formation of the study area, and the present tectonic framework is the product of the multi-stage structural superposition transformation. (2) the study area is located at the intersection of the two fold belts, and the relationship between the surface and the subterranean structure is complex. The structure is diverse. There are two groups of tectonic systems in different directions in NW and NE in this area. The characteristics of the two directions are as follows: the surface of the NW trending structure is in good agreement with the geodesic tectonics. Only the amplitude and strength of the structure have some differences: but the surface of the NE structural belt is not consistent with the deep structure of the underbelly, and the geocentric structure is characterized by complex morphology and fault development. (3) the tectonic stress field in the study area is mainly compressive stress field, and the tectonic stress field in the study area is mainly compressive stress field. Forming structural patterns such as folds, fault-bend folds, fault-spreading folds, imbricate faults and bidirectional thrust faults. (4) the northeastern Sichuan structure has undergone multiple tectonic movements and evolved for a long time. The present NNE and NW trending structures have undergone many stages of development and evolution. The study shows that the Neast-trending structures have been formed in the Indosinian period and were finally finalized in the early Himalayan period, while the NW-trending structures began to form in the late Yanshanian period. (5) the tectonic evolution and tectonic pattern are closely related to oil and gas accumulation, and the conditions of NE-trending tectonics in northeast Sichuan are obviously superior to those of NW-trending tectonics. (5) from the point of view of tectonic development history, NE-trending structure is superior to NW-trending tectonics. The reason is that the NE-trending structure has been formed in the Indosinian period and formed in the middle Yanshanian period. In time, it is matched with the peak period of hydrocarbon generation in the region. The distribution pattern of the NE-trending structure shows that the tectonic axis and fault strike are consistent with the main migration direction of oil and gas. The NW trending structure was formed in the late Yanshanian and did not match with the peak of hydrocarbon generation, which missed the best time for oil and gas accumulation. The present exploration practice also proves that the oil and gas resources of the NE trending structure (represented by the Luojiazhai structure) are better than that of the NW trending structure (Jinzhuping structure is the representative).
【學(xué)位授予單位】：西南石油大學(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)：2291817