【摘要】：Melut盆地為中非被動裂谷盆地,具有豐富的油氣資源,盆地發(fā)育2種類型的高砂地比地層。其中,古近系Yabus組與Samma組區(qū)域性厚層砂巖與Adar組區(qū)域泥巖形成的區(qū)域性高砂地比地層為盆地勘探初期的主力成藏組合,主要形成各種反向斷塊、斷鼻等構(gòu)造油藏;上白堊統(tǒng)Galhak組近源局部性砂泥互層高砂地比地層為盆地中后期構(gòu)造—巖性及巖性地層油氣藏勘探的主要成藏組合,為盆地新的成藏組合和勘探層系。通過對Galhak組高砂地比地層油藏特征、富集規(guī)律、油藏評價與勘探方法的研究,首次提出"湖泛泥巖控藏"與"辮狀河三角洲內(nèi)前緣分流河道砂體控富"認識,指出湖泛泥巖是Galhak組高砂地比地層成藏主控因素,"高孔厚砂巖"是高產(chǎn)油層形成的儲層條件,辮狀河三角洲內(nèi)前緣是高產(chǎn)油層發(fā)育的有利相帶。同時,提出了以湖泛泥巖劃分與對比為基礎(chǔ)的分層系評價,提高大套高砂地比地層的垂向研究尺度和評價精度;及以測井、錄井、油藏地質(zhì)等多方法相結(jié)合的油水綜合判識,提高大套高砂地比地層復(fù)雜斷塊油藏油水關(guān)系與油藏認識的合理性。該研究提升了Melut盆地局部性砂泥互層高砂地比地層的勘探潛力,拓展了盆地勘探空間,對中西非相似被動裂谷盆地高砂地比地層的勘探具有借鑒意義。
[Abstract]:The Melut basin is a non-passive rift basin with abundant oil and gas resources. Among them, the regional thick sandstone of Paleogene Yabus formation and Samma formation and regional mudstone of Adar formation are the main reservoir forming assemblages in the early stage of basin exploration, mainly forming various reverse fault blocks, fault nose and other structural reservoirs. The upper Cretaceous Galhak formation is the main reservoir forming assemblage of tectonic-lithologic and lithostratigraphic oil and gas reservoir exploration in the middle and late stage of the basin, and is a new reservoir formation and exploration strata in the basin. Based on the study of reservoir characteristics, enrichment rules, reservoir evaluation and exploration methods of high sand / ground ratio formation in Galhak formation, it is proposed for the first time that "the reservoir control of lacustrine pan mudstone" and "sand body control of distributary channel in front edge of braided river delta" are known for the first time. It is pointed out that the lacustrine pan mudstone is the main factor of reservoir formation in the Galhak formation with high sand ratio, "high porosity and thick sandstone" is the reservoir condition for the formation of high yield oil layer, and the front edge of braided river delta is the favorable facies zone for the development of high yield oil layer. At the same time, based on the division and correlation of the lacustrine pan mudstone, the evaluation of stratified system is put forward to improve the vertical research scale and the evaluation accuracy of the large set of high sand / ground ratio strata, and the comprehensive judgment of oil and water is based on the combination of logging, reservoir geology and so on. It is reasonable to improve the oil-water relationship and reservoir understanding in large sets of reservoirs with high sand ratio and complex fault block formation. This study has promoted the exploration potential of the local sand and mud interbedded high sand ratio formation in Melut basin, and expanded the exploration space of the basin, which has reference significance for the exploration of the high sand ratio formation in the similar passive rift basin in Central and West Africa.
【作者單位】： 中國石油勘探開發(fā)研究院西北分院;
【基金】：國家科技重大專項“大型油氣田及煤層氣開發(fā)”(編號:2008ZX05029)資助
【分類號】：P618.13

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