Research On Distribution Of Residual Oil In Member 1 Of The Shahejie Formation In Huangjindai Oilfield Of Liaohe Basin

With complex fault blocks, thin and disconnected sand bodys, huangjindai Oilfield is a part of Liaohe Oilfield located in Eastern Depression of rift-controlled Liaohe sub-basin. The difficulties of understanding the whole oilfield systematically are caused by these features. In addition, a large amount of hydrocarbons in the main reservoir have been exploited after exploring and developing for several decades. Therefore, according to reservoir four relationships,the second interpretation of log, gas-oil-water distribution rules and key control factors, we discussed in sub-layer scale to maintain the oilfield stable production.Research results show that the reservoir lithology, physical, containing oil and electricity with variation are consistent in Shahejie formation of huangjindai oilfield. The lithology is coarser, the better physical properties, oil more full, the better is electric. Oil level limit is oil stain, lithologic oil set is fine sandstone, oil porosity limit is 11%, the corresponding permeability limit is 10×10-3μm2, electrical oil limited resistivity 10Ω·m, sonic is 270μs/m.The result of this research show that hydrocarbon distribution in the study area are mainly controlled by complex fault blocks and sedimentary facies, in addition, reservoir lithology and physical conditions also have some effects on the distribution. As a result,combination traps which controlled by both structure and lithology is the main trap type.Hydrocarbons mainly distribute in the major structural high part and NE-SW trend fault block controlled banded area. Hydrocarbon distributed dispersedly in most sub-layers, and from bottom to top oil trapped worse yet gas trapped better. Remaining oil flocks in structural high area, fault barrier zone, relatively poor physical properties block, incompleted injection recovery and unused reservoir part. Vertical layers of the reserves are unbalanced, layered produced has large differences in degree, remaining recoverable reserves of vertical concentration and the main layer are not obvious, tapping the potential difficulty. The main horizons of S1 are high, the geological reserves is little, the remaining recoverable reserves are mainly in the middle formation of S1 and the underpart formation of S1.