Analysis of the Controls on Lithologic Oil Reservoir in Linyi Subsag, Huimin Sag

Key words: 
• lithologic oil reservoir /
• control factors /
• delt /
• fluxoturbidite /
• Linyi subsag

Abstract: Linyi subsag have many faults in Paleogene and Neogene. Meanwhile, their sedimentary facies and depositional systems change frequently.〖KG*2〗Those provided avail qualification for forming the lithologic oil reservoir. The lithologic oil reservoirs in Paleogene〖KG*2〗in Linyi subsag include three kinds, such as oil charged in lensshaped sand body, lithologic upclined pinchout oil reservoir〖KG*2〗and oil charged in sand body that connected on the flanks of the faults. It was suggested that oil charged in lensshaped sand body will easily take place in deep sag belts and delta front〖KG*2〗in gentle slope belts. It was also suggested〖KG*2〗that lithologic upclined pinchout oil reservoirs will easily take place in gentle slope belts. And then, oil charged in sand body that connected on the flanks of the faults easily take place nearby the tectonic belts that faults relatively developed. The exploration practice〖KG*2〗in Linyin subsag revealed that it has abundant oil resources. The primary factor analysis of main controlling〖KG*2〗factors for〖KG*2〗the lithologic oil reservoir forming suggests that the most important controlling factors are the distribution of delta front sand body and fluxoturbidite body and lake sand body, the characteristics of the sealing and translocation of the fault block and unconformability and the characteristics of the valid cap rocks. Under their main control factors, it formed different types of lithologic oil reservoirs in different tectonic positions and different sedimentary facies in order.