The Fine Description Of Chang6 Reservoir Group Of Chuan33area In Chuankou Oilfield

Chuankou Oilfield's geographical position is located in ChuanKou town Yan'an city Shaanxi Province. Its tectonic setting is located in the Shaanbei slope of the Ordos Basin.Chuan33 area is located in south of Chuankou Oilfield. There are many questions in Chuan33 area: the reservoir heterogeneity knew unclearly; sandbody has not subdivided to little layer which fit for the water-injection development unit during the Oilfied development; it was not realize perolation barrier and differential perolation in vertical direction at all. These questions had caused the oilfield water-injection development water-drive to affect the volume slightly, the reserves are producing degree, water-injection wells cannot compatibility for oil production, the remaining oil scattering and so on.The paper launches the research in view of these questions, take the reservoir fine description as the core, applies the multi-disciplinary knowledge, studies the Chuan 33 areas main layer Chang 6 oil layers ' stratum, sedimentary, microfacial, diagenesis, the natural characteristic and the oil layer heterogeneity. Then the reservoir flow unit was divided and established the Chang6 oil layers' natural parameter model. It will provide the theory basis for this area water-injection development in the future.According to the datum bed and the depositional cycle, Chuan33 area Chang6 oil layers were been divided four subunits, Chang6₁, Chang6₂, Chang 6₃, Chang 6₄. Because of Chang 6₁ reservoir are this research area's main oil-producing zone, Chang 6₁ will be subdivides three subzones Chang6₁¹, Chang6₁², Chang6₁³ in this articleChang6₁ oil layer's main sedimentary facies are delta facies, delta front subfacis, and growing submarine distributary channel, submarine divergence between bay, river marsh land and fluviatile flood-plain microfacies. The granulated substance body mops the characteristic to control mops to the reservoir sedimentary facies plane the characteristic.Through the core sample observation, the thin section, the granularity, the conventional nature, the pressure mercury, the electricity scanning and the experiment and so on, it takes these kinds of methods to study the area diagenesis and the reservoir nature. The compaction function, the cementation cause the primitive porosity nearly loss at all. It is the main reason which caused the reservoir has the low porosity and the lowest permeability; later period solution function, specially the dissolution of calcite and laumontite which improve the reservoir's the porosity and the permeability, but it has not changed the low porosity and the special low permeability characteristic in this area.This paper used the method which unified the flow belt index division FZI and the oil deposit non- isotropic composite index IRH divided Chang6 oil layers in this article. It is the first time using in divide flow unit. Concrete procedure: First, carries on the FZI index to the reservoir to ask to take; then, infiltrates the FZI index with other reflection porosity, permeability and the oil layer growth parameter strives for to take together the oil deposit non-isotropic composite index; last, using these parameter divides the flow unit. Using this method, Chang6 oil layers' flow unit can be divided for four kinds, the I kind and II kind are the primary kinds for the main oil layer Chang 6₁.Passed through Gauss using the foreword to simulate the method toe establish three dimensional to the Chang 6 oil layers natural parameter has mopped the model. It has really presented various subzones heterogeneity and the flow unit distributed characteristic under the reservoir.Through to make fine description for Chuan 33 area Chang6 oil layers Chuankou oilfield, it has clarified foundation geology condition in search area. It has provided the reliable theory basis for this area for exploration, the development in the future. At the same time, this conclusion will become the certain significance reference to this area or near the area which has similar oil pool condition.