Research On Remaining Oil Distribution Of Huangjindai Oilfield

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. And after decades of waterflooding, it was extremely complex and have a higher water content. Therefore, according to sedimentary characteristics, reservoir heterogeneity, oil, water distribution small layer level, based on the establishment of three-dimensional geological modeling, numerical reservoir simulation method, favorable area for distribution of remaining oil, reservoir of High Water thus be developed and deployed.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.