本文選題：百口泉組　切入點(diǎn)：連續(xù)型油氣藏　出處：《地球化學(xué)》2017年03期

【摘要】：在準(zhǔn)噶爾盆地瑪湖凹陷斜坡區(qū)下三疊統(tǒng)百口泉組地層中發(fā)現(xiàn)大面積連片巖性油氣藏。對(duì)西斜坡百口泉組一段和二段8個(gè)含油儲(chǔ)集巖樣分別提取自由態(tài)組分、束縛態(tài)組分和油氣包裹體組分,并進(jìn)行GC、GC-MS和GC-IRMS分析。結(jié)果表明,3類油氣組分三環(huán)萜烷主峰含量遠(yuǎn)高于C_(30)藿烷,反映充注到百口泉組(T1b)儲(chǔ)層的原油均具有很高的成熟度,相當(dāng)于Ro1.20%。生物標(biāo)志物指標(biāo)β-胡蘿卜烷/(β-胡蘿卜烷+nC20)、伽馬蠟烷/(C_(30)藿烷+伽馬蠟烷)、三環(huán)萜烷/(三環(huán)萜烷+藿烷)、Ts/(Tm+Ts)、C_(29)Ts/(C_(29)藿烷+C_(29)Ts)、C_(30)重排藿烷/(C_(30)重排藿烷+C_(30)藿烷)和甾烷C_(21)/(C_(21)+∑C_(29))比值均顯示從自由態(tài)組分、束縛態(tài)組分至油氣包裹體組分成熟度依次降低的特征,表明油氣組分在油藏充注過程中不斷升高。與此相反,Pr/nC_(17)和Ph/nC_(18)比值以及正構(gòu)烷烴單體碳同位素組成顯示從自由態(tài)組分、束縛態(tài)組分至油氣包裹體組分成熟度依次升高的特征,表明油氣組分從成藏早期至晚期成熟度降低。由于充注的原油為不同成熟度油氣組分混合產(chǎn)物,生物標(biāo)志物在原油中屬于微量及痕量組分,而Pr、Ph和正構(gòu)烷烴屬于常量組分,Pr/nC_(17)和Ph/nC_(18)比值以及正構(gòu)烷烴單體δ~(13)C值更能代表主體原油的成熟度。因此,對(duì)于瑪湖凹陷西斜坡油氣藏,主體原油成熟度從成藏早期至晚期是降低的。根據(jù)8個(gè)油砂樣3類油氣組分的成熟度可以推斷油氣充注期介于晚侏羅世-白堊紀(jì)之間。蓋層密封性是控制這類油氣藏成藏的重要因素。在晚侏羅世之前,下伏二疊系蓋層一直阻止了油氣沿?cái)鄬舆\(yùn)移。至晚侏羅世-白堊紀(jì),下伏蓋層的密封性遭受破壞,油氣才從下伏二疊系沿?cái)鄬舆\(yùn)聚至百口泉組一段和二段儲(chǔ)層(T_1b~(1 2))。由于上覆百三段(T_1b~3)和克拉瑪依組(T_2k)蓋層自始至終保持密封狀態(tài),百口泉組一段和二段儲(chǔ)層(T_1b~(1 2))成為瑪湖凹陷油氣的最終歸宿。
[Abstract]:In the lower Triassic Baikouquan formation in Mahu sag, Junggar Basin, a large area of lithologic reservoirs were found in the Baikouquan formation. Free fractions were extracted from 8 oil-bearing reservoir samples in the first and second member of Baikouquan formation on the West Slope, respectively. The results show that the main peak content of tricyclic terpene is much higher than that of C ~ (30) cariane, which reflects the high maturity of the crude oil injected to the T1b) reservoir of Baikouquan formation, and the analysis of the bound state and hydrocarbon inclusion components by GC GC-MS and GC-IRMS shows that the main peak content of tricyclic terpene is much higher than that of C ~ (30). The biomarker index of 尾 -carotene rne (尾 -carrodane nC20) and tricyclic terpene rne (TsP ~ (TM) TsP / C ~ (29) TsP / C29) and steric terpene (C) and steric terpene (n / c / C ~ (30)) and steroidal terpene (n / c / c ~ (30)) and steric terpene (n / c / c ~ (30)) and steroidal terpene (n / c / c ~ (30)) and steric / steric terpene respectively (n / C / C ~ (30)) and steric terpene (n / n C ~ (20) C ~ (30) C ~ (30) C ~ (30)). The ratio of C / D 21) 鈭，

本文編號(hào)：1688409