發(fā)布時(shí)間：2018-07-08 17:40

  本文選題：金湖凹陷 + 構(gòu)造特征��； 參考：《中國(guó)石油大學(xué)(華東)》2015年碩士論文

【摘要】：金湖凹陷位于蘇北盆地的東臺(tái)坳陷西部,是蘇北盆地的主要油氣富集單元之一。凹陷的南部斷裂系統(tǒng)極其發(fā)育,斷裂對(duì)油氣藏形成起到至關(guān)重要的作用,現(xiàn)已發(fā)現(xiàn)的油氣藏主要為斷鼻和斷塊油氣藏。因此,尋找構(gòu)造油氣藏仍然是金湖凹陷小斷塊油氣藏勘探的重中之重。在沉積學(xué)、構(gòu)造地質(zhì)學(xué)以及石油地質(zhì)學(xué)的基礎(chǔ)上,結(jié)合地震資料、巖心資料和測(cè)井資料,對(duì)研究區(qū)內(nèi)的構(gòu)造特征、沉積特征以及斷層的封閉性展開研究。通過三維地震解釋,對(duì)研究區(qū)內(nèi)斷層進(jìn)行精細(xì)解釋,并將斷層劃分為四個(gè)級(jí)別,其中,最為發(fā)育的為三級(jí)斷層;斷層的平面組合樣式主要為平行式、斜交式、雁列式和馬尾狀,剖面組合樣式主要有“Y”字形、地塹和地壘以及階梯狀。通過地層對(duì)比,繪制研究區(qū)地層等厚圖、砂體等厚度,分析儲(chǔ)層發(fā)育規(guī)律,并結(jié)合巖心觀察資料,最后確定研究區(qū)沉積相發(fā)育規(guī)律:阜二段主要為濱淺湖亞相,阜三段主要為三角洲前緣亞相,阜四段下部為三角洲前緣亞相,上部則為湖泊相。結(jié)合砂、泥巖分布規(guī)律,分析生儲(chǔ)蓋組合:阜二段上部的泥巖和阜四段上部泥巖既可作為良好的烴源巖,又可作為區(qū)域性蓋層,阜二段下部砂巖和阜四段下部砂巖因具有良好的生儲(chǔ)蓋組合條件而具有形成油氣藏的優(yōu)越條件;阜三段在縱向上存在多個(gè)區(qū)域性的蓋層。通過巖性對(duì)置法、泥巖涂抹因子等對(duì)斷層的側(cè)向封閉性進(jìn)行研究,通過斷裂帶泥質(zhì)含量法、聲波時(shí)差法和斷面正應(yīng)力法對(duì)斷層的垂向封閉性進(jìn)行研究:汊澗地區(qū)側(cè)向封閉性較好,阜四段的垂向封閉性較好,阜三、阜二段垂向封閉性中等;銅城地區(qū)側(cè)向封閉性較好,是控制成藏的主要因素,而垂向封閉性中等。通過對(duì)油氣分布規(guī)律研究,發(fā)現(xiàn)油氣主要聚集在兩條斷層所形成的扇形斷塊中,若扇形圈閉中具有良好儲(chǔ)層,則很可能會(huì)形成油氣藏。因此,結(jié)合沉積相展布情況,優(yōu)選孔滲性好的扇形斷塊,可以對(duì)有利目標(biāo)進(jìn)行預(yù)測(cè)。
[Abstract]:Jinhu sag is located in the west of Dongtai depression in Subei basin and is one of the main oil and gas enrichment units in Subei basin. The fault system in the southern part of the sag is very developed and the fault plays an important role in the formation of oil and gas reservoirs. The oil and gas reservoirs discovered now are mainly fault-nose and fault-block reservoirs. Therefore, finding structural reservoirs is still the most important part of exploration for small fault blocks in Jinhu sag. On the basis of sedimentology, structural geology and petroleum geology, combined with seismic data, core data and logging data, the structural characteristics, sedimentary characteristics and sealing characteristics of faults in the study area are studied. Through 3D seismic interpretation, fine interpretation of faults in the study area was carried out, and the faults were divided into four levels, among which the most developed were third-grade faults, and the plane combination styles of the faults were mainly parallel, oblique, echelon and horsetail. The cross-section combination is mainly Y-shaped, graben and barrier and ladder-shaped. Through stratigraphic correlation, drawing stratigraphic map of equal thickness and thickness of sand body in the study area, analyzing the law of reservoir development, and combining with core observation data, finally determining the regularity of sedimentary facies development in the study area: the second member of Fu2 is mainly a subfacies of littoral shallow lake, The main subfacies of the third member is delta front, the lower part of Fu4 is delta front, the upper is lacustrine. Combined with the distribution law of sand and mudstone, the authors analyze the assemblage of source reservoir and caprock: the mudstone in the upper part of the second member of Fu2 and the upper mudstone of the 4th member of Fu can be used as both good source rock and regional caprock. The sandstones of the lower part of the second member of Fu2 and the lower part of the fourth member of Fu4 have favorable conditions for forming oil and gas reservoirs due to their favorable conditions of generation, reservoir and caprock assemblage, and there are several regional caprocks in the longitudinal direction of the third member of FU. The lateral sealing of faults is studied by lithologic contrast method, mudstone smear factor, and shale content method in fault zone. The vertical sealing properties of faults are studied by acoustic moveout method and section normal stress method: the lateral sealing is better in Jijian area, the vertical sealing is better in the fourth member of Fu, the vertical sealing is moderate in the third and second member of Fu, and the lateral sealing is better in Tongcheng area. It is the main factor to control the accumulation, while the vertical closure is moderate. By studying the distribution of oil and gas, it is found that oil and gas are mainly concentrated in the fan-shaped fault blocks formed by two faults. If there are good reservoirs in the fan-shaped traps, oil and gas reservoirs are likely to be formed. Therefore, combined with the distribution of sedimentary facies, a sector fault block with good porosity and permeability can be selected to predict the favorable target.
【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
【分類號(hào)】：P618.13

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