本文關(guān)鍵詞： 斷裂體系 輸導(dǎo)體系 油氣藏 控制規(guī)律　出處：《中國(guó)石油大學(xué)(華東)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：渤中凹陷位于渤海灣盆地中部,面積廣,油氣資源豐富,但勘探程度低,故而通過(guò)本次研究,明確渤中凹陷斷裂體系特征,確定油氣運(yùn)移輸導(dǎo)體系,總結(jié)渤中凹陷斷裂對(duì)油氣成藏的控制規(guī)律,為渤中凹陷油氣進(jìn)一步勘探打下基礎(chǔ)。本文對(duì)渤中凹陷斷裂基本特征進(jìn)行了詳細(xì)討論;對(duì)渤中凹陷油氣輸導(dǎo)體系進(jìn)行了分析研究;精細(xì)解剖了已發(fā)現(xiàn)的油氣藏,確定了油氣成藏的有利因素,在此基礎(chǔ)上,歸納總結(jié)出斷裂對(duì)油氣成藏的控制規(guī)律。本文通過(guò)地震手段,提取相干體,綜合地震剖面對(duì)渤中凹陷不同時(shí)期斷裂體系進(jìn)行了詳細(xì)刻畫(huà)。古近系受伸展作用,斷裂具拉張性質(zhì);新近系受郯廬斷裂右旋活動(dòng)影響,斷裂具一定的剪切性質(zhì)。由深及淺斷裂由單一的主斷裂演化為斷裂帶或斷裂組合,向上撒開(kāi)呈枝狀展布,斷裂規(guī)模逐漸減小,級(jí)別降低,連續(xù)性變差,組合樣式由斜交式、平行式等演化為雁列式、帚狀等。本文通過(guò)地震剖面統(tǒng)計(jì)同沉積斷層兩盤(pán)厚度差,計(jì)算斷層活動(dòng)速率,以此反映斷層活動(dòng)性。渤中凹陷各時(shí)期斷層活動(dòng)強(qiáng)度呈“M+翹尾”形態(tài)。依據(jù)區(qū)域構(gòu)造運(yùn)動(dòng)、斷層切穿地層、斷裂活動(dòng)性和油氣成藏期綜合研究,渤中地區(qū)斷裂活動(dòng)時(shí)期為沙三段、東三段、東二段、館陶組和明化鎮(zhèn)組沉積時(shí)期。對(duì)渤中地區(qū)已有的油氣藏進(jìn)行解剖分析,反推油氣運(yùn)移方式,研究區(qū)油氣輸導(dǎo)體系分為三類(lèi):斷層輸導(dǎo)體系、階梯狀斷層—砂體輸導(dǎo)體系和不整合—斷層—砂體輸導(dǎo)體系。論文精細(xì)研究渤中地區(qū)237個(gè)油氣藏,統(tǒng)計(jì)其相關(guān)影響因素,總結(jié)了斷裂對(duì)油氣成藏的控制規(guī)律:主斷裂溝通油源,垂向輸導(dǎo)油氣;淺層次級(jí)斷裂再次分配油氣,擴(kuò)大油氣分布范圍,并形成了大量構(gòu)造圈閉;主次斷裂相互耦合構(gòu)成了良好的枝狀輸導(dǎo)體系。次級(jí)斷裂同向輸導(dǎo),反向遮擋;斷層活動(dòng)速率在0-30m/Ma,SGR0.3、Rm0.35,組合樣式為斜交式、雁列式、Y字形、似花狀和階梯狀的斷裂成藏條件好。平面上斷裂相交處、凹形處和走滑斷裂增壓段,斷裂遮擋條件好,對(duì)油氣聚集成藏有利。斷層封閉性是油氣成藏的主要影響因素,其次是輸導(dǎo)體系,斷層活動(dòng)速率、斷裂類(lèi)型和斷層遮擋類(lèi)型次之。
[Abstract]:Bozhong sag is located in the middle of the Bohai Bay basin with a wide area and rich oil and gas resources, but the exploration degree is low. Therefore, through this study, the characteristics of the fault system in the Bozhong sag are clarified, and the oil and gas migration and transportation system is determined. This paper summarizes the rules of controlling oil and gas accumulation by faults in Bozhong Sag, and lays a foundation for further exploration of oil and gas in Bozhong Sag. The basic characteristics of faults in Bozhong Sag are discussed in detail in this paper. The oil and gas transportation system in Bozhong sag is analyzed and studied. The discovered oil and gas reservoirs are carefully dissected, and the favorable factors for oil and gas accumulation are determined. On this basis, the control law of fault on oil and gas reservoir formation is summarized. In this paper, coherent bodies are extracted by seismic means. The fault system in different periods of Bozhong sag is described in detail by comprehensive seismic section. The Paleogene system is extensional and the fault is extensional; The Neogene is affected by the right-lateral activity of the Tanlu fault, and the fault has a certain shear property. The deep and shallow faults evolved from a single main fault to a fault zone or fault assemblage with a branch spreading upward, and the scale of the fault gradually decreased. The grade is reduced, the continuity is bad, the combination style is changed from oblique type, parallel type and so on to geese, broom, etc. In this paper, the thickness difference of the two plates of the same sedimentary fault is counted by seismic profile, and the rate of fault activity is calculated. According to the regional tectonic movement, fault cutting strata, fault activity and oil and gas reservoir forming period, the comprehensive study of fault activity in Bozhong sag is based on the regional tectonic movement, fault cut through strata, fault activity and hydrocarbon accumulation period. The active period of fault in Bozhong area is the sedimentary period of the third member of Sha, the third member of east part, the second member of east part, the Guantao formation and the Minghuazhen formation. The oil and gas reservoirs in Bozhong area have been dissected and analyzed, and the migration patterns of oil and gas have been pushed back. There are three types of oil and gas transport systems in the study area: fault transport system, ladder fault-sand body transport system and unconformity fault-sand body transport system. The related influencing factors are analyzed and the rules of controlling oil and gas accumulation by fault are summarized: the main fault communicates oil source and vertical transporting oil and gas; The shallow fault redistributes oil and gas, expands the distribution range of oil and gas, and forms a large number of structural traps. The primary and secondary faults are coupled to each other to form a good branch-like transport system. The fault activity rate ranges from 0 to 30 m / m Mai SGR 0.3% Rm 0.35, and the combination pattern is oblique and Y-shaped. The reservoir forming conditions of flower-like and ladder-like faults are good. At the intersecting of the faults on the plane, at the concave and strike-slip faults, the conditions of fault occlusion are good. Fault sealing is the main influencing factor of oil and gas accumulation, followed by transportation system, fault activity rate, fault type and fault occlusion type.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【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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