發(fā)布時間：2018-11-19 07:10

【摘要】：本文在對研究區(qū)多口探井的鉆井、測井、分析化驗等靜態(tài)資料與試氣、試采等動態(tài)資料分析的基礎(chǔ)上,對鄂爾多斯盆地西南部上古生界天然氣藏的成藏動力來源、古流體壓力狀態(tài)、異常高壓成因以及增壓大小進行了深入研究,并進一步將動力與成藏聯(lián)系起來,總結(jié)其成藏動力模式。主要取得了以下認識:通過流體包裹體測試分析,對研究區(qū)上古生界盒8、山1段儲層古壓力進行恢復(fù),結(jié)果顯示上古生界石盒子組及山西組存在古超壓,主要為弱超壓-超壓系統(tǒng)。前人認為鄂爾多斯盆地上古生界石盒子組、山西組古超壓的成因主要為壓實不均衡導致的,但本次研究從沉積速率、測井響應(yīng)、生烴強度、成巖等多方面進行論證認為古超壓成因主要為生烴引起的增壓。建立煤系烴源巖生烴增壓的數(shù)值模型并進行計算得出,超壓形成時期主要發(fā)生在晚侏羅世、早白堊世氣藏進入大量生烴期之后,并且累計生成的超壓與試氣產(chǎn)量有一定的正相關(guān)性,間接說明了形成超壓的主要成因為生烴超壓,并且這種超壓作為油氣運移的主要動力,為成藏起到了一定的貢獻作用。綜合各項研究結(jié)果,研究區(qū)成藏動力模式主要有兩種,一種是早白堊末期之前烴源巖生烴作用形成的巨大壓力是天然氣運移的重要動力源,由于研究區(qū)在地史中缺乏天然氣的大規(guī)模側(cè)向運移的條件,天然氣主要在異常壓力驅(qū)動下以幕式涌流方式進行運移,主要為垂向、近距離、快速成藏,代表為研究區(qū)山1氣藏。而在早白堊世末期地層被抬升剝蝕之后,由于溫度、壓力、應(yīng)力的下降,生烴增壓沒有能量的供給無法再成為天然氣運移的動力,后期主要是在天然氣濃度差的作用下通過做擴散運移,代表為研究區(qū)盒8氣藏。
[Abstract]:Based on the static data of drilling, logging and analysis of many exploration wells in the study area and the dynamic data of gas test and production test, this paper analyzes the source of reservoir forming power of the Upper Paleozoic natural gas reservoir in the southwest of Ordos Basin. The pressure state of paleofluid, the origin of abnormal high pressure and the size of supercharge are deeply studied, and the dynamic model of reservoir formation is summarized. The main results are as follows: through the fluid inclusion test and analysis, the paleo pressure of the Upper Paleozoic Box 8 and the first member of the Shan formation in the study area has been restored. The results show that there is paleo overpressure in the Upper Paleozoic Shihezi formation and Shanxi formation. Mainly for the weak overpressure-overpressure system. It is believed that the origin of paleo overpressure in Upper Paleozoic Shihezi formation and Shanxi formation in Ordos Basin is mainly caused by uneven compaction. However, this study is based on sedimentation rate, log response and hydrocarbon generation intensity. Diagenesis and other aspects demonstrate that the origin of paleo-overpressure is mainly caused by the pressurization caused by living hydrocarbons. The numerical model of hydrocarbon generation pressure in source rocks of coal measures is established and calculated. It is concluded that the formation of overpressure occurred mainly in the late Jurassic and after the early Cretaceous gas reservoir entered a large hydrocarbon generation period. And there is a positive correlation between accumulative overpressure and gas production, which indirectly shows that the overpressure is mainly caused by hydrocarbon generation overpressure, and this overpressure, as the main driving force of oil and gas migration, plays a certain contribution to reservoir formation. Based on the results of various studies, there are mainly two types of dynamic models for reservoir formation in the study area. One is that the huge pressure formed by hydrocarbon source rock hydrocarbon generation before the end of early Cretaceous is an important power source for natural gas migration. Due to the lack of the condition of large-scale lateral migration of natural gas in the study area, natural gas is mainly transported by curtain inrush flow driven by abnormal pressure, mainly vertical, short distance, rapid accumulation, represented by mountain 1 gas reservoir in the study area. After the strata were uplifted and denuded at the end of the early Cretaceous, because of the decrease of temperature, pressure and stress, the hydrocarbon-generating pressure could not become the driving force of natural gas migration without energy supply. In the later stage, diffusion migration is mainly done under the action of gas concentration difference, which is represented by box 8 gas reservoir in the study area.
【學位授予單位】：西安石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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