Large Ancient King Oilfield 67 Low-permeability Reservoir Geology, And Research And Development,

Block Dagu 67 of Dawangzhuang oil field is a low permeability faulted reservoir closed by faults. Because of low permeability and big interval between injector and producer, the development degree of Permian reservoir is in its low degree and the development effect is worse.Based on the core observation result, it is determined that the reservoir of Block Dagu 67 belongs to fluvial face. Then Wanshan segment of upper Shihezi formation is divided into 3 layer groups, 14 layers. And the lower Shihezi formation is divided into 4 layers. By using 3D seismic data combined with geological data, the reliable structure is gotten. Based on core data, the author constructed the interpretation model of parameter and carried out secondary digital interpretation on the logging data. At last we got various parameters of reservoir. Then the author carried out quantificational description on the macro heterogeneity, micro pore throat structure and permeability of the reservoir. So the variation of physical property, distribution of reservoir, quality of the seal and distribution of the seal is clarified. Based on the analysis of development process and producing feature,_the authorstudied the producing reserve and well pattern controlling status. The author also made it essential and applicable to carry out separate minelayer producing, well infilling and fracturing. The basic reason interfering the producing is that low permeability and big well spacing. According to the research result, the ideal well spacing is 200-250 m.Thus Block Dagu 67 has the potential to drill infilling wells. The dissertation lays a scientific foundation on the enhance oil recovery of Block Dagu 67.