本文選題：頁巖油 + 滯留烴��； 參考：《中國石油大學(xué)(華東)》2015年碩士論文

【摘要】：沾化凹陷沙三段優(yōu)質(zhì)烴源巖分布廣、厚度大,演化程度處于生油高峰期,具備形成泥頁巖油氣的物質(zhì)基礎(chǔ)。本文選取沾化凹陷沙三下亞段塊狀、層狀和紋層狀等代表性烴源巖樣品進(jìn)行主要生油期的生排烴模擬實(shí)驗(yàn),結(jié)合熒光薄片和環(huán)境掃描電鏡分析,探討不同巖性烴源巖生排烴效率差別,排出油及滯留液態(tài)烴數(shù)量和組成差異以及滯留液態(tài)烴儲(chǔ)集空間及賦存,對(duì)頁巖油形成和賦存進(jìn)行初步評(píng)價(jià)。通過生排烴模擬實(shí)驗(yàn)及熒光薄片和環(huán)境掃描電鏡觀察發(fā)現(xiàn)不同巖性烴源巖生排烴過程,排出及滯留液態(tài)烴組成以及滯留液態(tài)烴儲(chǔ)集和賦存均存在一定差別。三種不同類型烴源巖生油率,滯留烴及排出油產(chǎn)率均隨模擬溫度升高呈現(xiàn)先增大后減小的趨勢(shì)。紋層狀烴源巖Ro范圍在0.7%~1.0%之間滯留烴產(chǎn)率明顯大于排出油,滯留率/排出率最大達(dá)5.37(Ro=0.8%);在生油早期階段分餾現(xiàn)象明顯,排出油較滯留烴含有更多的輕質(zhì)組分;層間微裂縫是滯留液態(tài)烴主要儲(chǔ)集空間,寬度隨成熟度增大而增大,此外方解石晶間孔縫及石英、黃鐵礦、粘土礦物晶間孔內(nèi)也賦存一定量液態(tài)烴。層狀烴源巖Ro范圍在0.7%~0.9%之間滯留烴產(chǎn)率明顯大于排出油,滯留率/排出率值在Ro為0.7%時(shí)最高;生油早期階段排出油含有較多輕質(zhì)組分,但分餾現(xiàn)象較紋層狀烴源巖不明顯;滯留液態(tài)烴主要賦存在方解石邊緣裂縫,黃鐵礦、白云石晶間及粘土礦物孔隙中,作為儲(chǔ)集空間的裂縫形成作用非常明顯。塊狀烴源巖僅在Ro為0.7%時(shí)滯留烴產(chǎn)率大于排出油產(chǎn)率;排出油和滯留烴組成差異不大;隨演化程度增強(qiáng),巖石出現(xiàn)裂縫,滯留液態(tài)烴主要賦存于與生烴相關(guān)的裂縫中,其它液態(tài)烴零星分散在粘土礦物孔隙中。根據(jù)不同類型烴源巖生烴過程,結(jié)合沾化凹陷羅家地區(qū)沙三下亞段有機(jī)質(zhì)演化剖面,認(rèn)為塊狀、層狀和紋層狀頁巖油勘探的最有利成熟度范圍分別為0.7%~0.9%,0.7%~1.0%,0.8%~1.1%,對(duì)應(yīng)的深度段分別為3300~3600m、3300~3800m、3600-4000m。但塊狀烴源巖由于有機(jī)碳含量和富集度低,并不十分有利于頁巖油形成。
[Abstract]:The high quality source rocks of the third member of Shahejie formation in Zhanhua depression are widely distributed, thick, and the evolution degree is in the peak of oil generation, which has the material foundation to form shale oil and gas. In this paper, the typical source rock samples, such as block, stratiform and laminar layers, are selected to simulate hydrocarbon generation and expulsion in the main oil generation periods in Zhanhua sag, combined with fluorescence flake and environmental scanning electron microscope analysis. This paper discusses the difference of hydrocarbon generation and expulsion efficiency of different lithologic source rocks, the difference of quantity and composition of discharged oil and retained liquid hydrocarbon, and the storage space and occurrence of retained liquid hydrocarbon, and makes a preliminary evaluation on the formation and occurrence of shale oil. Through hydrocarbon generation and expulsion simulation experiment, fluorescence thin slice and environmental scanning electron microscope, it is found that there are some differences in hydrocarbon generation and expulsion process, expulsion and liquid hydrocarbon composition, reservoir and occurrence of retained liquid hydrocarbon in different lithologic source rocks. The oil generation rate, residual hydrocarbon yield and oil output rate of three different types of source rocks increased first and then decreased with the increase of simulated temperature. In the range of 0. 7% ~ 1. 0% of laminated source rock, the yield of retained hydrocarbon is obviously higher than that of oil, and the maximum retention rate / discharge rate is 5. 37 ~ 0. 8%, the fractionation phenomenon is obvious in the early stage of oil generation, and the expelled oil contains more light components than the remaining hydrocarbon. Interlayer microfracture is the main reservoir space of liquid hydrocarbon, and the width increases with maturity. In addition, there are some liquid hydrocarbon in intergranular pore of calcite and quartz, pyrite and clay mineral. In the range of 0. 7 ~ 0. 9% of stratiform source rocks, the yield of retained hydrocarbon is obviously larger than that of the expelled oil, and the value of retention rate / discharge rate is the highest when Ro is 0. 7, the oil discharged in the early stage of oil generation contains more light components, but the fractionation phenomenon is less obvious than that of laminated source rocks. The residual liquid hydrocarbon mainly occurs in the edge fractures of calcite, pyrite, dolomite intergranular and clay mineral pores. The residual hydrocarbon yield of block source rock is only greater than that of expelled oil when Ro is 0.7, and the difference between expelled oil and residual hydrocarbon composition is not obvious. With the increase of evolution degree, cracks appear in the rock, and the residual liquid hydrocarbon mainly occurs in the fractures related to hydrocarbon generation. Other liquid hydrocarbons are scattered in the pores of clay minerals. According to the hydrocarbon generation process of different types of hydrocarbon source rocks, combined with the evolution profile of organic matter in the lower member of Sha3 in Luojia area, Zhanhua Sag, it is concluded that the most favorable maturity range for exploration of massive, stratified and laminated shale oil is 0.70.0.0.0.0.0.10 and 0.80.1.1and the corresponding depth is 33003600m33003800mt ~ 3600-4000m. However, block source rocks are not very favorable for shale oil formation because of their low organic carbon content and enrichment.
【學(xué)位授予單位】：中國石油大學(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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