| The Southern Huaziping District is a new exploration block of Ansai Xingzichuan oil production plant, in recent years, the block gradually stepped into the exploitation stage. Due to the distribution of sand body and sedimentary microfacies did not described subtly. At the same time, the region of reservoir lithology, electric, oil and reservoir characteristics did not deeply understand, which severely restricted the further exploration of oil and gas. It is necessary to research geological characterization, reservoir four-property relationgship and characteristics of oil reservoir at this place for this situation.This paper is based on petroleum geology, reservoir sedimentology and several other geological branches, with the help of drilling data, well logging data, mud logging data, analysis of test data and production data, studying the distribution of sedimentary facies, reservoir characteristics, reservoir of Four-property relationship and reservoir characteristics of Southern Huaziping, and summarizes the control factors of rerional reservoir.The southern Huaziping have performed gentle western-leaning monoclinal and two rolling nose-like uplift. The chang 6 oil-bearing is delta front subfacies. Underwater distributary channel and river mouth dam is the skeletal sand body of reservoir in the study area, where the oil and gas storage. The study place upgrowth residual intergranular pore, dissolution intergranular pore, Intragranular dissolved pore, micro pore and microcracks. dissolution intergranular pore, Intragranular dissolved pore and residual intergranular pore are the mainly pore type. The experimental analysis of porosity mainly distributed in 9.0-11.0%, the average is 9.2%.The permeability mainly distributed in 0.2-0.6×10-3μ2, the average is 0.52×10-3μm2, belonging to low porosity, low permeability reservoir.Based on the studying of the Four-property Relationship, we know that the lithologic lower limit is fine sandstone and the oil-bearing occurrence is oil stains level or above it at this place. The effective reservoir selective of the lower limit of porosity and permeability is 7.5%,0.24×10-3μm2. Electrical chart determine the lower limit of effective thickness, when the acoustictime is more than 224.0 μs/m and the deep induction electric resistance is 18.0 Ω-m. When the acoustictime is between 216.0 to 224.0 μs/m, then the deep induction electric resistance accord 186 minus 0.75 times of acoustictime.The oil saturation is 38.0%. The logging interpretation of porosity is 7.5～14.1%, the average value of the study area is 9.8%. The permeability is 0.24-3.21×10μm2, the average value is 0.57×10-3μ2.The chang 6 oil-bearing is a typical lithologic oil pool at the southern Huaziping area, in which the distribution of petroleum is uneven on the space. In the vertical direction, petroleum was mainly distributed in the Chang 61 and 62 districts, while the Chang 63 district contained a small fraction of petroleum. In the horizontal direction, petroleum mainly accumulated in the extended zone of Huaziping area, which was located in the northwestern end of the study area. The petroleum of study is low abundance and low productivity, it was a small and light reservoir located in middle-shallow strata featuring an ultra-low porosity and permeability. The petroleum generation was affected by multiple factors, such as distribution of valid sand body, the obstruction by mudstone and tight sandstone, nose uplift and laumontite solution pore. |
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