伊洛瓦底盆地沙林凹陷石油地质特征

通过对伊洛瓦底盆地区域地质分析和沙林凹陷石油地质条件分析,认为凹陷油气成藏条件优越,始新统三角洲前缘亚相泥页岩和沼泽亚相煤系泥岩具有较强的生烃能力,为油气富集提供了丰富的物质基础,并与逆冲断裂带共同控制了油气田的分布;良好的生储盖配置、继承性圈闭及由断层、渗透层和不整合面共同构成的油气输导体系,为油气的聚集提供了运移通道和空间;良好的成藏配置关系形成了始新统-渐新统/中新统下生上储型成藏组合,主力含油砂体形成多重层状油气藏,待发现的始新统自生自储成藏组合主要位于逆冲断层下盘。凹陷北部D区块已在始新统塔本组发现该套成藏组合,沙林凹陷内具有相同的地层和构造圈闭特征,具有较好的勘探前景。

Petroleum geological characteristics of Sarin sag in Irrawaddy basin

Through regional geological analysis of Irrawaddy basin and petroleum geological condition analysis of Sarin sag,Sarin sag is believed to be of superior conditions for hydrocarbon accumulation.Eocene series delta front subfacies shale and mud swamp subfacies coal shale has strong ability of hydrocarbon generation,which provides rich material base for oil and gas enrichment,in combination with the thrust fault zone,it can jointly control the hydrocarbon distribution.Good generation-reservoir-caprock association,successive traps and hydrocarbon transportation systems constituted by faults,permeable zones and unconformity surface can provide migration channels and space for oil and gas accumulation.Good reservoir-forming assemblages can form Oligocene-Miocene the lower generation and upper storage pattern and the main oil sands body can form a multiple layered reservoirs.The waited-to-be-found Oligocene self-generating and self-preserving reservoirs are mainly lied in the thrust fault footwall,and it has been found in Taben formation of Eocene series,which is located in D block of the northern sag.Similar formation and structural trap characteristics have been found in Sarin sag and therefore,it has a good exploration prospect.