Research On The Exploration Of Subtle Reservoir In The Western Depression Of Liaohe Basin

Qingshui sag is a larger source sag in western depression of Liaohe Basin. There is a enormous potential source area and reservoir capacity. In this article , the features of the structure and the deposition and the reservoir in Qingshui sag were researched by using the methods of interpreting the fine 3-D seismic data and well logging and impedance inversion, and total 50 faults and 32 traps were found in the study area, increased trap area 6.11 km2. On the base, the structure and the reservoir of the western depression in Liaohe Basin had been recognized and known again. The main acknowledge include:1,The target layer faults in the study area were developed mainly in the deposition of to Ed at the early or middle time. The tectonic movement was the vertical sliding mainly along the fault plane, whose direction was main east-west or near east-west. The fracture was dumping to south, and compared with the development of other faults. In the decline site of the fracture, it was easy to form an accompanied structure with it. The whole tectonic framework of Es1+2 in the study area performed on a dump slope from north to south, the height difference was near 2000 meters. The work area can be divided into two tectonic zones bounded by F1 faults: the northern was fault block and the southern was slope.2,There was a thick Cenozoic sedimentary strata in the study area. Because the depositional environment in different times was very different, it made the reservoir in different group having a very distinctive sedimentary characteristics. At the condition of a certain structure, the developed degree of the reservoir of oil and gas could apparently control the enrichment level of the reservoir. The condition of the reservoir decided the oil-bearing capacity of the reservoir. In study area there had excellent reservoir conditions that the oil resource was plenty, the reservoir was developed, the cap was stability, and having smooth migration pathway and favorable reservoir-seal combination.3,In the three-dimensional seismic reservoir, the sparse seismic pulse inversion method and extracting property methods had been used very well, and the results of prediction had been confirmed by drilling.4,because of the southern area of the Majuanzi and the eastern area of the Shuangtaizi are near to the Qingshui sag, we ought to make a seismic interpretation in a large area for finding more reservoir of oil and gas.5,There are some bodies of deposition liking delta in the southern area. We ought to study the Subtle trap through predicting the reservoir of oil and gas.