本文選題：蓬萊9-1構(gòu)造 + 構(gòu)造演化��； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：蓬萊9-1油田位于渤海海域廟西北凸起上,是近年來中國近海首次發(fā)現(xiàn)的一個以花崗巖古潛山風(fēng)化殼為儲層的大型油田。目前國內(nèi)針對燕山運動期中生代侵入的花崗巖古潛山油氣如何成藏且成藏規(guī)模之大研究非常匱乏。本文綜合利用磷灰石裂變徑跡模擬、巖心觀察、薄片鑒定、測井資料分析、生物標(biāo)志化合物對比、包裹體記錄等技術(shù)手段,結(jié)合蓬萊9-1構(gòu)造地質(zhì)背景,對潛山的構(gòu)造演化、花崗巖儲層特征、油源對比及成藏條件進(jìn)行了詳細(xì)剖析,恢復(fù)了蓬萊9-1構(gòu)造花崗巖古潛山油氣成藏過程,并建立了油氣成藏模式。主要取得以下研究成果:(1)在距今164Ma時,花崗巖巖漿底辟式侵入變質(zhì)巖中,之后潛山花崗巖主要經(jīng)歷了164Ma~(55.0~53.5)Ma的快速隆升剝蝕期,(55.0~53.5)Ma~(34.0~33.5)Ma的構(gòu)造穩(wěn)定期,距今(34.0~33.5)Ma~23.3Ma的再次快速隆升剝蝕期,以及距今23.3Ma以后的緩慢沉降期,形成花崗巖古潛山。(2)花崗巖古潛山風(fēng)化殼呈現(xiàn)出明顯的分帶性,從上至下,依次為砂質(zhì)風(fēng)化帶、礫質(zhì)風(fēng)化帶、裂縫帶和基巖帶,儲集空間類型主要為粒間孔、溶孔、微裂縫及顯微裂縫。在平面上,根據(jù)儲層厚度、孔隙度和儲集空間類型分為儲層發(fā)育區(qū)、儲層欠發(fā)育區(qū)和儲層不發(fā)育區(qū),儲層越發(fā)育的地區(qū),總的油層厚度也較厚。儲層發(fā)育區(qū)主要分布在蓬萊9-1構(gòu)造的東南部,也是古潛山風(fēng)化殼的高部位,受風(fēng)化、剝蝕作用最強烈,由東南向西北方向,儲層發(fā)育成都逐漸降低。(3)原油受生物降解嚴(yán)重,降解程度達(dá)到7級以上,已不能使用飽和烴生物標(biāo)志化合物來分析油源,但從蓬萊9-1油田潛山原油和油砂樣品的甲基三芳甾烷參數(shù)可以看出潛山原油主要為沙一段與沙三段混源油,為Es1+Es3型原油;南部潛山的PL9-1-11、PL9-1-12、PL9-1-14井區(qū)潛山原油有東營組烴源巖生成原油的后期充注,表現(xiàn)為Es1+Ed型原油。(4)蓬萊9-1潛山花崗巖油源來自于渤東南洼沙河街組及東營組烴源巖,均為優(yōu)質(zhì)烴源巖。沙河街組烴源巖在館陶組沉積末期進(jìn)入生烴門限,明下段沉積末期開始進(jìn)入大量生排烴階段,而現(xiàn)今已達(dá)到生油高峰期。東營組烴源巖在明下段沉積末期開始進(jìn)入生烴門限,而現(xiàn)今處于大量生排烴階段。潛山油氣以不整合面-斷層為輸導(dǎo)系統(tǒng),油氣運移主要是通過不整合面上、下的“底礫巖連通孔隙”及“風(fēng)化、淋濾帶裂縫-溶蝕孔洞”兩類高效運載層運移輸導(dǎo)。潛山油氣藏的直接蓋層是上覆館陶組地層,而館陶組沉積的底部是一套水下分流河道間灣沉積,紫紅色泥巖或紫褐色泥巖的沉積,剛好在潛山不整合面之上,它的厚度決定了潛山油氣能否較好的保存和油氣藏的油質(zhì)。(5)距今(55Ma~53.5Ma)~23.3Ma,花崗巖區(qū)呈現(xiàn)洼地的地貌輪廓,并遭受風(fēng)化剝蝕形成儲層,渤東凹陷新近系沙河街組及東營組相繼沉積;距今23.3Ma~12Ma,館陶組沉積覆蓋于潛山之上,形成潛山油藏的直接蓋層;距今12Ma-現(xiàn)今,沙河街組烴源巖進(jìn)入大量生、排烴階段,同時東營組開始進(jìn)入生烴門限,并經(jīng)過3.2Ma的油氣主充注期,油氣通過斷層及不整合面,運聚到潛山頂部形成大型油藏。
[Abstract]:Penglai 9-1 oilfield is located in the northwestern Temple of Bohai sea area. It is the first large oil field with granite ancient Qianshan weathering crust discovered in recent years in China's offshore area. At present, the major research on how the Paleozoic granitic Qianshan oil and gas reservoirs are formed and the reservoir forming models are very scarce in China. The comprehensive utilization of this paper is made in this paper. The apatite fission track simulation, core observation, thin slice identification, logging data analysis, biomarker contrast, inclusion recording and other technical means, combined with the 9-1 tectonic geological background of Penglai, the structural evolution of Qianshan, the characteristics of granite reservoir, oil source contrast and reservoir formation are detailedly analyzed, and the ancient Penglai 9-1 tectonics granite is restored. Qianshan oil and gas accumulation process, and established oil and gas accumulation models. The main results are as follows: (1) the granite diapir was intruded into metamorphic rocks at 164Ma, after which Qianshan granite experienced the rapid uplift and erosion period of 164Ma~ (55.0~53.5) Ma, the structural stability period of (55.0~53.5) Ma~ (34.0~33.5) Ma, and now (34.0~33.5) Ma~23. The second rapid uplift and erosion period of.3Ma and the slow settlement period after 23.3Ma have formed the granite ancient Qianshan. (2) the granite ancient Qianshan weathering crust showed obvious zonation, from upper to lower, it was sandy weathered zone, gravel weathering zone, fracture zone and bedrock zone, and the reservoir space types were mainly intergranular pore, pore dissolution, micro fissure and microscopy. On the plane, according to the thickness of reservoir, porosity and reservoir space types, the reservoir is divided into reservoir development area, the reservoir is underdeveloped area and reservoir undeveloped area, the area of the reservoir is more developed, the thickness of the total oil layer is thicker. The reservoir development area is mainly distributed in the southeastern part of the 9-1 structure of Penglai, and is also the high part of the ancient Qianshan weathering crust, which is weathered and denuded. With the strongest, from the southeast to the northwest direction, the reservoir development Chengdu gradually decreases. (3) the crude oil is seriously biodegraded and the degree of degradation reaches over 7. It is impossible to use the saturated hydrocarbon biomarker compound to analyze the oil source, but from the parameters of the methyl three aryl sterane of the Qianshan crude oil and the oil sand samples of the 9-1 oil field of Penglai, it can be seen that the Qianshan crude oil is mainly The mixed source oil of Sha 1 and Sha three sections is Es1+Es3 type crude oil. The Qianshan crude oil in the southern Qianshan, PL9-1-11, PL9-1-12 and PL9-1-14, has the late filling of the Dongying formation hydrocarbon source rocks, showing Es1+Ed type crude oil. (4) the Penglai 9-1 Qianshan granite oil source is derived from the Shahe Street formation and the Dongying formation source rocks in the Bohai southeast depression, and all are the high quality source rocks. The hydrocarbon source rocks of the river block entered the hydrocarbon generation threshold at the end of the Guantao formation, and the late Ming period began to enter a large number of hydrocarbon generating and expulsion stages, but now it has reached the peak period of oil generation. The source rocks of the Dongying formation began to enter the hydrocarbon generation threshold at the end of the lower Ming period, and now in a large number of hydrocarbon generation stages. The oil and gas in Qianshan are transported with unconformable surface fault as the conduction. In the system, the migration of oil and gas is mainly carried out through two kinds of high efficient carrier layers, which are "basal conglomerate connected pores" and "weathering and leaching zone". The direct cover of Qianshan oil and gas reservoirs is the overlying Guantao formation, while the bottom of the Guantao formation is a set of underwater distributary interchannel Bay deposits and purple red mudstones. The deposition of or purple brown mudstone is just above the unconformities of Qianshan. Its thickness determines whether Qianshan oil and gas can be preserved well and oil and gas reservoirs. (5) 55Ma~53.5Ma ~23.3Ma, the granite region presented a low-lying geomorphic contour and suffered from weathering denudation to form a reservoir. The Neogene Shahe Street formation and Dongying formation in the Bodong sag were successively deposited. After 23.3Ma~12Ma, the Guantao formation was deposited over Qianshan to form the direct cover of the Qianshan reservoir, and now the hydrocarbon source rocks of the Shahe Street Group entered a large number of life and hydrocarbon expulsion stages, and the Dongying formation began to enter the hydrocarbon generation threshold, while the Dongying group began to enter the hydrocarbon generation threshold, and through the 3.2Ma oil and gas filling period, the oil and gas were transported to the top of Qianshan through the faults and unconformities to form the top of Qianshan. Type reservoir.

【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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