本文選題：輸導體系 + 砂體　； 參考：《東北石油大學》2015年碩士論文

【摘要】：油氣輸導體系連接源巖和圈閉,控制油氣運移的方向和規(guī)模,是油氣地質(zhì)研究的重要內(nèi)容之一。吐哈盆地臺南凹陷三疊系現(xiàn)已發(fā)現(xiàn)大量油氣儲量,多數(shù)油藏屬于源外聚集,需有砂體、不整合和斷裂等輸導體系溝通進行長距離運移才能形成。因此,論文工作重點主要研究砂體、不整合和斷裂各自的輸導能力和組合規(guī)律,分析其在油氣成藏過程中所起的輸導作用,總結成藏規(guī)律,預測油氣有利聚集區(qū)帶,為臺南凹陷進一步的油氣勘探開發(fā)工作提供參考。論文利用構造和沉積資料研究輸導砂體的宏觀分布,并采用錄井、測井、實驗室鑄體薄片分析的和物性測試來研究砂體的物性特征和影響因素。通過統(tǒng)計斷層的分布特征來研究其對油氣輸導過程的影響,并用分形理論分析斷裂和油氣聚集之間的關系。此外,利用地震解釋結果和單井分析資料研究不整合的類型和分布特征,建立不整合面下物性變化模式來分析判斷不整合對地層物性的影響。最后,通過原油物性資料判斷油氣運移的方向,并利用數(shù)值模擬方法再現(xiàn)油氣運移的路徑,總結油氣聚集規(guī)律,預測油氣的有利聚集區(qū)。通過研究,論文主要取得以下認識:1、臺南凹陷三疊系砂巖是重要的輸導層,巖性以細砂巖為主,沉積環(huán)境以辮狀三角洲平原和前緣為主。儲層物性主要為中孔-高孔、低滲-高滲-特高滲儲層。成巖階段在早成巖階段B期-晚成巖階段A期。2、高砂地比地層是有效的儲集層段,其它砂巖小層不能作為儲集層。并通過分析剖面小層分布與含油氣性的關系總結出有效砂巖輸導體的下限,“油浸+飽含油”的孔隙空間厚度下限為11.3m,“油斑+油跡+熒光”的孔隙空間厚度下限為7.5m。3、斷層溝通源儲,其封閉與開啟影響到油氣聚集的結果,斷層分形結果表明,現(xiàn)今油氣分布區(qū)集中在盒維數(shù)大于1.505的區(qū)域。而局部不整合對儲層物性有改善作用,容易形成油氣聚集。由砂體、斷層和不整合共同組成了臺南凹陷三疊系油氣輸導體系的立體空間結構。4、油氣主要來源于臺北凹陷二疊系,并通過火焰山斷層向上溝通到三疊系發(fā)生長距離運移。運移路徑主要有兩條:一是從西北向東長距離沿砂體構造脊運移;二是從北部凹陷向南穿越斷層短距離成藏。油氣最為有利的成藏區(qū)為火焰山斷壘帶和魯克沁斷階帶。
[Abstract]:Oil and gas transportation system connects source rock and trap and controls the direction and scale of oil and gas migration, which is one of the important contents of oil and gas geology research. A large number of oil and gas reserves have been found in Triassic system in Tainan sag of Turpan-Hami Basin. Most reservoirs belong to the accumulation outside the source and need the communication of sand bodies, unconformities and faults for long distance migration. Therefore, the main work of this paper is to study the transport ability and combination law of sand bodies, unconformity and faults, to analyze their transport function in the process of oil and gas accumulation, to sum up the rules of reservoir formation, and to predict the favorable oil and gas accumulation zones. It provides a reference for further oil and gas exploration and development in Tainan sag. In this paper, the macroscopic distribution of transported sand bodies is studied by using structural and sedimentary data, and the physical characteristics and influencing factors of sand bodies are studied by means of logging, lab casting sheet analysis and physical property tests. The influence of fault distribution on the process of oil and gas transportation is studied by statistical analysis, and the relationship between fault and hydrocarbon accumulation is analyzed by fractal theory. In addition, the types and distribution characteristics of unconformity are studied by using seismic interpretation results and single well analysis data, and the variation model of physical properties under unconformities is established to analyze and judge the influence of unconformity on formation physical properties. Finally, the direction of oil and gas migration is judged by the physical property data of crude oil, and the path of oil and gas migration is reproduced by numerical simulation method, and the law of oil and gas accumulation is summarized, and the favorable accumulation area of oil and gas is predicted. Through the research, the paper mainly obtains the following understanding: the Triassic sandstone in Tainan sag is an important transport layer, the lithology is dominated by fine sandstone, and the sedimentary environment is dominated by braided delta plain and front edge. Reservoir physical properties are mainly medium-high porosity, low-permeability-high-permeability-super-high permeability reservoir. The diagenetic stage is in the early diagenetic stage B to the late diagenetic stage A. 2. The high sand to ground ratio formation is an effective reservoir, and other sandstone reservoirs can not be used as reservoir. The lower limit of effective sandstone conductors is summed up by analyzing the relationship between the distribution of small layers in the section and the petroliferous properties. The lower limit of pore space thickness of "oil-saturated oil" is 11.3 m, and that of "oil spot fluorescence" is 7.5m. 3. The sealing and opening of the pore space can affect the accumulation of oil and gas. The fractal results of fault show that the oil and gas accumulation is affected by the oil and gas accumulation. At present, the distribution of oil and gas is concentrated in areas with box dimension greater than 1.505. The local unconformity can improve the physical properties of the reservoir and can easily form oil and gas accumulation. The three-dimensional spatial structure of the Triassic oil and gas transport system in Tainan sag is composed of sand body, fault and unconformity. The oil and gas mainly originate from Permian system in Taibei sag, and the long distance migration takes place through the upward communication to Triassic system through Huojiashan fault. There are two main migration paths: one is from northwest to east along the sandbody tectonic ridge, the other is from the north depression to south through the fault to form a short distance reservoir. The most favorable hydrocarbon forming areas are Huoyanshan fault barrier belt and Lukeqin fault terrace zone.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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