Geological Modeling Of Chang6 Oil Reservoir Set In Xinghe, Ansai Oil Field

In order to have a integral and in-depth understanding of Chang6 Oil Reservoir Set in Xinghe, Ansai Oil Field, to offer a strong foundation for the next excavation of remaining oil and enhance the recovery ratio of oil reservoir. The paper analyzed the geologic body of the study area based on petroleum geology, sedimentology, sequence stratigraphy, mathematics, geostatistics and integrated kinds of dynamic and static data include drilling, logging, log and test oil data ,which from microcosmic to macroscopic, from internal to interlayer and from reservoir to barriers. At last, the geological modeling of Chang6 Oil Reservoir Set in Xinghe, Ansai Oil Field was set up by GMSS software which reconstruct the geologic character of the study area authentically and lay a foundation for exploitation of the reservoir efficiently.The Primary results and innovation include:(1) Three sand sets of Chang6 oil layer in the study area was divided for 10 thin layers by the dynamic combination of the High-resolution sequence stratigraphy and the tradition cycle-thickness correlation method based on the former research works. It built the sequence-stratigraphy framework correctly and revealed the character of the microstructure.(2) There are 7 micro sedimentary facieses including under water distributaries channel, rnouth bar, sand sheet, channel flank, interchannel mud, interdistributary bay, subsea natural barrier and the front blanket-sand which was recognized by using the combination method of drilling core facies and well logging facies. From the development of Sedimentary microfacies and the character of each periods to see that the channel of the study area was mainly distributed by NE-SW tending. The channel grows stably and there is a good succession in each period. The depth of sand is large and fundamentally together.(3) The paper analyzed the Chang6 Reservoir by the character of Petrology, pore structure, diagenesis, physical property, spatial distribution of sandstones and heterogeneity. Finally, it is concluded that Sedimentary and diagenesis is the main factor of the reservoir.Then,chose the main factor and divided the reservoir for three types: G (good), F(fare), P (poor) .The second layer is the main oil layer which have a strong progradation inthe Sedimentary periods and have a large depth and good physical property. Therefore, the development of G type is good .The primary type of the other layers is F type. G type and P type is the Subordinate Factor.(4) Chang6 Oil Reservoir Set in Xinghe is lithologic pinchout oil reservoir. Therefore, porosity and permeability was chosen for the best parameter, which influence the seepage character. In the study the flow unit was divided into 4 types which is A> B, C and D.The flow unit that has been plot out was validated using seepage experiment with natural sandstone micromodels for the first time.(5) Based on the above study, the geological model of Chang6 Oil Reservoir Set in Xinghe was set up by using GMSS software which include well model, structure model, sand body model and attribute model. The plane grid of model is 50m x 50m . The geological model was divided into three areas that have a direct understanding of the reservoir distribute character in 3D space...