Fine Reservoir Description Of Gao6 Block

Gao6 block which lies in the north of chenqiao rural–jinbei rural with the position on the western slope of Jinhu depression is the subject of Gaoji oilfield, its construction formed by faults cutting off is a nose structure. The oil-bearing area of Gao6 block is 2.4 Km2, the geological reserves is 533×104t and all of them is in use. Gaoji oilfield is a small complex block oilfield. Reservoir thickness and area which mostly distributes along the fault in band is small, due to the affact of the structure,fault,lithology,physical property and other factors. Besides, the oil-water interface of each layer is differernt and reservior porosity is low. Heterogeneity in layers and between layers is serious. Nowadays, many probloms has risen in water injection and development, such as the munber of oil-well turning to water-well is increasing, the speed of water invasion is increasing. The situation of oilfield stable development becomes worse and the contradiction of interlayers is expanding including the contradiction between the main sand body and other sand bodys. In order to resolve these rising poberloms, we integrate the utilization of geology, geophysics and analtsis assay data to apply the comparison of layers based on the study of facies and reservior property, with the guidance of petroleum, geological statistics and reservior sedimentary. The fine description of Gao6 block undoutbly provide theoretical guidance and decision making for production increasion and oilfield sustainable development.During the whole study course, we build the framework of high-resolution sequence stratigraphic based on datum cyclic bedding. The division and correlation between layers also completes based on the comparison of skeleton. According to core observation, sedimentory environment and depositional characteristics anslysis as well as previous studies, we think that the main facies in Fuyi segment of Gao6 block includes channel distributary,recent river flood, far river flood and mud(mudflat and distal basin). Sandy beach,sand dam,channel and mud(waterfront shallow lake and deep lake) is the dominant sedimentaoy facies of Fuer segment of Gao6 block. The study area is divided into four kinds of flow unit after the detailed study of reservior flow property of Gao6 block. Followed by these is the three-dimensional geological modeling, at the first stage, we established the fault model and stucture model, then the facies model is built with the application of suquential indicator simulation, also, the property midel(porosity model and permeability model) is established with sequential gaussian simulation based on facies-controlled theory. Finally, NTG model and oil saturation model of Gao6 block is defined. The calculated reserves which indicates that the models are of high accuracy is close to primary reserves.