本文選題：致密油 + 成藏動(dòng)力　； 參考：《西安石油大學(xué)》2015年碩士論文

【摘要】：松遼盆地齊家地區(qū)白堊系發(fā)育有兩套致密油層,分別是泉頭組三、四段的扶余油層和青山口組二、三段的高臺(tái)子油層。通過(guò)對(duì)地質(zhì)資料(構(gòu)造演化史、儲(chǔ)層致密史、成藏史)、測(cè)井曲線響應(yīng)特征的綜合分析研究,認(rèn)為水動(dòng)力、構(gòu)造作用力和浮力均不能作為高臺(tái)子油層致密油的成藏動(dòng)力,只有超壓才能推動(dòng)石油進(jìn)入致密儲(chǔ)層形成油藏。包裹體測(cè)壓結(jié)果顯示,高臺(tái)子油層在嫩江組末期和明水組末期發(fā)生過(guò)兩次油氣充注,而且明水組末期為明顯的高壓異常,進(jìn)一步證實(shí)石油是由超壓推動(dòng)進(jìn)入高臺(tái)子油層。大規(guī)模地層超壓的形成有泥巖欠壓實(shí)和有機(jī)質(zhì)生烴增壓兩種機(jī)理,其中欠壓實(shí)成因超壓的保存時(shí)期早于儲(chǔ)層致密時(shí)間,其不是致密油成藏的主要?jiǎng)恿?只有生烴增壓才能夠獨(dú)立推動(dòng)石油進(jìn)入致密儲(chǔ)層形成油藏。為了衡量生烴增壓提供的動(dòng)力大小,提出累計(jì)最大剩余壓力的概念,所謂累計(jì)最大剩余壓力是指假設(shè)烴源巖在一期的連續(xù)生烴過(guò)程中處于完全封閉環(huán)境,沒(méi)有烴類的排出,生成的烴類全部積蓄在烴源巖的孔隙中時(shí)所達(dá)到的剩余壓力。通過(guò)改進(jìn)后的生油增壓計(jì)算模型結(jié)合盆地模擬技術(shù)對(duì)青山口組烴源巖在主要成藏時(shí)期的累計(jì)最大剩余壓力進(jìn)行了計(jì)算,結(jié)果表明青一段烴源巖生烴產(chǎn)生的超壓在明水組末期可達(dá)50MPa以上,青二-三段烴源巖可達(dá)40MPa以上,遠(yuǎn)大于烴源巖的破裂壓力及致密儲(chǔ)層的排驅(qū)壓力,可以作為致密油成藏的動(dòng)力。在嫩江組末期成藏時(shí),石油是由欠壓實(shí)成因的超壓和生烴產(chǎn)生的超壓共同作用排出烴源巖,從而形成油藏。
[Abstract]:There are two sets of dense reservoirs developed in Qijia area of Songliao Basin, namely Fuyu reservoir of the third and fourth member of the Quantou formation and the Gaotaizi reservoir of the second and third member of the Qingshankou formation. Based on the comprehensive analysis of geological data (structural evolution history, reservoir density history, accumulation history) and the response characteristics of logging curves, it is concluded that hydrodynamics, tectonic forces and buoyancy can not be used as reservoir forming power of dense oil in Gaotaizi reservoir. Only overpressure can push oil into the tight reservoir to form a reservoir. The pressure measurement results of inclusions show that there were two oil and gas filling processes in Gaotaizi oil reservoir at the end of Nenjiang formation and Mingshui formation, and the obvious high pressure anomaly at the last stage of Mingshui formation, which further proves that the oil is pushed into Gaotaizi reservoir by overpressure. The formation of large-scale formation overpressure has two mechanisms: mudstone undercompaction and organic matter hydrocarbon generation pressurization, among which the undercompaction origin overpressure was preserved earlier than the reservoir densification time, and it is not the main motive force for tight oil accumulation. Only hydrocarbon-generating pressurization can independently push oil into tight reservoirs to form reservoirs. In order to measure the power provided by hydrocarbon-generating pressurization, the concept of accumulative maximum residual pressure is put forward. The so-called accumulative maximum residual pressure means that the source rock is assumed to be in a completely closed environment during the first stage of continuous hydrocarbon generation without the expulsion of hydrocarbons. The residual pressure reached when all the generated hydrocarbons are accumulated in the pores of the source rock. The accumulative maximum residual pressure of the source rock of Qingshankou formation during the main reservoir forming period was calculated by using the improved oil source pressurization calculation model and basin simulation technology. The results show that the overpressure generated by source rocks in Qingyi member can reach more than 50 MPA at the end of Mingshui formation and over 40 MPA in the source rocks of the second and third member of Qinghai formation, which is much larger than the fracture pressure of source rocks and the displacement pressure of tight reservoirs. It can be used as the motive force of dense oil accumulation. In the late stage of formation of Nenjiang formation, oil is expelled from source rock by the overpressure caused by undercompaction and hydrocarbon generation, thus forming reservoir.
【學(xué)位授予單位】：西安石油大學(xué)
【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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