A Study On The Sedimentary System And Reservoir Characters Of S/P/G Reservoirs In YingTai Area

The main target of this paper is to analyze the sedimentary environment of S/P/G reservoirs in YingTai area base on delicate core description and combine the material of well logging and seismic, and then analyze the control of the structure to the sedimentary system by analyze the structure characters. Study on the mud thin zone, geometry character of mirco-hole and the low electric resistivity reservoirs, and analyze the control factors of the oil-water relationship and forecast the beneficial area at last.Analyze the characters and kinds of the structure and vertical sequence, identify four micro faces which related reservoirs: under water distributary channel, under water crevasse splay, mouth bar and sand sheet. Dispart the delta front to inner delta front and outer delta front. The sand bodies of the inner delta front are from under water distributary channels and under water crevasse splays, the former is good at the physical property and has a good single pass connectivity, and the latter has a high independence and can form a suit of fake- connected sand body. The sand bodies of the outer delta front have high flat connectivity, but there are many mud thin zones, and the vertical heterogeneity is powerful.Base on many mud films in the core, observe and statistics the mud films and the micro structures of them. Analyses the genesis of the mud films from the sedimentary dynamics and lithogenesis, and analyze the genesis of the micro structures from the factors such as biology disturbance, seismic action et al. Statistic the number of the mud films by the core observing and confirm the frequency of them. Confirm there are 20-50 mud films in the front sheet and 10-20 in the mouth bar. Progress a finite numeral simulation to the mud film by the Eclipse software.According the self-similarity of the sand flat conformation of delta sand and the vertical frequency of the mud thin bed and combine some basic geologic material and interrelated literatures, bring the theory of holographic geology first time, think that geological bodies are generated not only the physical grain, but also the sedimentary of the geological information, local geological body can contain much or all information of the whole geological body which it belong to. The phenomena of geological holography can be found in three fields: geological configuration, activity frequency and information of geological bodies.Study on the geometry characters of the micro hole generated by different micro faces, extract and calculate the fractal dimension of them, and analyses the character of the reservoirs from the view angle of FD. Due to there are some pyrite tubercles in some silt, according to that pyrite tubercles can bring low electric resistivity reservoirs, study on the origin of the low electric resistivity reservoirs in study area and use the method of clustering differentiate of low- resistivity layers by logging eigenvalues to forecast some low- resistivity layers in study area.Analyze the control of the structure to the sedimentary system by the analyses of the structure characters and structure evolution. Use the data of testing for oil and well logging interpretation combine some sections to confirm the control element of the oil-water, and synthesize all the studies in this paper, forecast some beneficial zones in different oil layers.