本文選題：水道-朵體沉積 + 控制因素��； 參考：《石油學(xué)報(bào)》2017年09期

【摘要】：近年來在東非魯伍馬盆地深水區(qū)古近系深水沉積砂體中連續(xù)發(fā)現(xiàn)大型天然氣藏,該盆地已成為全球天然氣勘探熱點(diǎn)地區(qū)。但是魯伍馬盆地勘探程度低,深水沉積砂體研究相對(duì)滯后,嚴(yán)重制約了下一步油氣勘探工作�；趲r心、測(cè)井及三維地震資料,建立了東非魯伍馬盆地陸坡深水區(qū)漸新統(tǒng)層序地層格架,通過分析水道-朵體沉積特征,并結(jié)合區(qū)域地質(zhì)資料,探討了水道、朵體等富砂深水沉積的控制因素,并建立了相應(yīng)的沉積模式。魯伍馬盆地漸新統(tǒng)自下而上劃分為SQ1、SQ2和SQ3共3個(gè)三級(jí)層序,水道-朵體沉積發(fā)育在每個(gè)層序的低位域。研究區(qū)SQ1和SQ2層序發(fā)育水道、朵體沉積,SQ3層序以水道沉積為主。受始新世末東非大陸抬升及全球"冰室"氣候影響,盆地物源供給增加,三角洲向海進(jìn)積,引發(fā)陸坡水道-朵體等重力流沉積。向北流動(dòng)的南極底流改造水道-朵體沉積,通過淘洗重力流沉積提高水道和朵體的砂地比,并在水道北側(cè)形成側(cè)積砂體和漂積體,限制了后期重力流沉積,導(dǎo)致水道向南側(cè)向遷移、朵體向南延伸。研究結(jié)果可以為魯伍馬盆地乃至整個(gè)東非陸緣盆地深水儲(chǔ)集砂體預(yù)測(cè)及油氣勘探提供一定理論依據(jù)。
[Abstract]:In recent years large natural gas reservoirs have been continuously discovered in the Paleogene deep-water sedimentary sandbodies in the deep water area of the Ruwuma Basin in East Africa. The basin has become a hot spot for natural gas exploration in the world. However, the exploration degree of Luwuma basin is low, and the study of deep-water sedimentary sand bodies is lagging behind, which seriously restricts the further oil and gas exploration work. Based on the core, logging and 3D seismic data, the sequence stratigraphic framework of the Oligocene in the deep water area on the slope of the Luwu Ma Basin in East Africa is established. The watercourse is discussed by analyzing the sedimentary characteristics of the watercourse and the dolomite and combining with the regional geological data. The controlling factors of sand-rich deep water deposits such as dolomite have been established and the corresponding sedimentary models have been established. The Oligocene in the Luwu Ma Basin is divided into three third-order sequences SQ1SQ2 and SQ3 from the bottom to the top. The watercourse and dolomite deposits are developed in the low order domain of each sequence. In the study area, the SQ1 and SQ2 sequences developed waterways. Influenced by the continental uplift in East Africa at the end of the Eocene and the global "ice chamber" climate, the source supply of the basin increased and the delta protruding to the sea, which led to the gravity flow deposition such as the waterway and the dolomite on the slope of the land. The northward flow of the Antarctic bottom flow reconstructs the watercourse-dolomite deposition, improves the sand / land ratio of the channel and the dolomite through the washing gravity flow deposition, and forms the lateral sand and drift deposits on the north side of the watercourse, which limits the late gravity flow deposition. Causes the waterway to the south lateral migration, the flower body extends southward. The results can provide a theoretical basis for prediction of deep water reservoir sand bodies and oil and gas exploration in Luwuma basin and the whole East African continental margin basin.
【作者單位】： 西安石油大學(xué)地球科學(xué)與工程學(xué)院;中國石油杭州地質(zhì)研究院;中海油研究總院;
【基金】：中國石油天然氣股份有限公司重大科技項(xiàng)目“海外海洋勘探技術(shù)與有利目標(biāo)評(píng)價(jià)研究”(2014D-0908)資助
【分類號(hào)】：P618.13

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