本文選題：四川盆地 + 南華紀��； 參考：《天然氣工業(yè)》2017年06期

【摘要】：隨著四川盆地的油氣勘探不斷向深層—超深層領域拓展,以及在盆地中部地區(qū)(川中)穩(wěn)定繼承性古隆起區(qū)域的中上元古界—下古生界儲量超1×1012 m~3大氣田的發(fā)現(xiàn),該盆地深部古老層系烴源巖發(fā)育環(huán)境、烴源巖有機質生源構成及其成烴特征等備受關注。為此,基于前人的研究成果,開展了四川盆地東南緣南華系大塘坡組野外露頭剖面觀察和烴源巖樣品的有機地球化學、有機巖石學分析測試。結果表明:(1)四川盆地東南緣在南華紀古城期和南沱期2個冰期之間發(fā)育拉張背景下的大塘坡組黑色頁巖優(yōu)質烴源巖,其厚度介于16~180 m,礦物組成以黏土礦物和碎屑石英為主;(2)大塘坡組頁巖為高豐度過成熟腐泥型優(yōu)質烴源巖,其低姥植比(0.32~0.83)、低伽馬蠟烷豐度、高豐度三環(huán)萜烷以及相對高含量的C_(27)、C_(29)甾烷等特征,反映了低鹽度強還原環(huán)境下藻類和細菌微生物為其主要生源構成。結論認為:(1)川中地區(qū)南華紀裂谷內可能發(fā)育大塘坡組烴源巖,加里東期之前的古隆起、古斜坡區(qū)域是源于大塘坡組烴源巖的古油藏或分散液態(tài)烴的有利聚集場所;(2)該盆地內部穩(wěn)定區(qū)域有可能發(fā)現(xiàn)源于大塘坡組烴源巖的古油藏或分散有機質裂解氣的規(guī)模聚集區(qū)。
[Abstract]:Along with the exploration of oil and gas in Sichuan basin expanding to deep and super deep field, and the discovery of gas fields in the Middle and Upper Proterozoic and Lower Paleozoic in the stable inherited paleouplift area in the middle part of the basin (central Sichuan), the reserves of the Middle and Upper Proterozoic have exceeded 1 脳 1012 mm3 gas fields. The development environment of the source rocks of the ancient strata in the deep part of the basin, the organic composition of the source rocks and the characteristics of hydrocarbon generation have attracted much attention. Based on the previous research results, the outcrop profile of Datangpo formation of Nanhua series in the southeastern margin of Sichuan Basin was observed and the organic geochemistry and organic petrology of source rock samples were analyzed. The results are as follows: (1) the black shale source rocks of the Datangpo formation developed between the two glacial periods in the Nanhua Jiangucheng and Nantuo periods in the southeastern margin of the Sichuan Basin. The mineral composition is mainly clay and clastic quartz. (2) the shale of Datangpo formation is a Gao Feng mature saprotic high quality source rock with low base-to-plant ratio (0.32 ~ 0.83) and low abundance of gamma-alkane. The characteristics of high abundance tricyclic terpene and relatively high content of C _ (27) C _ (29) sterane reflect that algae and bacteria are the main biogenic components in the environment of low salinity and strong reduction. The conclusions are as follows: (1) the source rocks of Datangpo formation and the paleouplift before Caledonian may be developed in the South China rift in central Sichuan. The paleo-slope region is the paleoreservoir derived from the source rock of the Datangpo formation or the favorable accumulation place for dispersed liquid hydrocarbon. (2) it is possible to find the paleoreservoir derived from the source rock of the Datangpo formation or the scale accumulation area of dispersed organic cracking gas in the stable region of the basin.
【作者單位】： 中國石油勘探開發(fā)研究院;中國石油天然氣集團公司天然氣成藏與開發(fā)重點實驗室;中國石油西南油氣田公司;中國科學院大學滲流流體力學研究所;
【基金】：國家科技重大專項(編號:2016ZX05007-003) 中國石油天然氣股份有限公司科技項目(編號:2016B-0602)
【分類號】：P618.13

【相似文獻】

相關期刊論文 前7條

1 黃慧瓊;許效松;劉寶s，

本文編號：2052853