[地質(zhì)]前三角洲

It can be divided into 2 subfacies of fan delta-front and fan prodelta,and 6 microfacies. 可進一步分為扇三角洲前緣和前扇三角洲兩個沉積亞相及六個微相。

The sparse prodelta turbidite dist ributed on the eastern abrupt margin of the basin and the depositional systems came f rom the east . 后者發(fā)育于盆地中部的東緣陡坡帶 ,物源由東向西推進。

Distributary channel was well developed, prodelta was relatively not well developed and delta front was dominated by subaqueous distributary channel deposits. 研究區(qū)三角洲平原分流河道沉積極為發(fā)育，前三角洲相對不發(fā)育，三角洲前緣也以水下分流河道沉積為主。

The interpretation of a typical sub-bottom profile reveals that the diapir of the Yellow River delta resulted from the interior deformation of soft prodelta layers at the delta front. 高分辨率黃河三角洲典型的地震地層和解釋地層剖面、淺地層剖面和鉆孔資料聯(lián)合解釋表明,海底刺穿的發(fā)源層來自于河口沙壩下部的前三角洲相軟弱層變形。

Keywords Western Sichuan Depression;shallow gas reservoir;sealing ration of fault;permeability of fault;seismic facies;sedimentary facies;prodelta facies sand;channel facies;sand; 川西凹陷;淺層氣藏;斷層封堵性;斷層滲透性;地震相;沉積相;三角洲前緣相;河道相;砂體;