Reseach On Characteristics Of Chang6Reservoir In Huachi-Nanliang Region

Huachi-Nanliang region is one of Changqing Oilfield to realize the grand goalof50million tons of main battlefield, as quickly and efficiently buildingthe capacityin the recent years, the follow-up to replace reserves is obviously insufficient, theurgent need to find a new production building blocks. Chang6reservoirs inHuachi-Nanliang are more common and can generally be found in strata, which aremore abundant because the oil is recognized by the world in the Mesozoic, theexisting wells to obtain commercial oil flow, with good exploration prospects.This paper will go more in-depth characterization of the study area Sedimentarycharacteristics and distribution of micro-phase plane, with a focus on reservoircharacteristics, through the preparation of a variety of plan members, from macro tomicro, from the plane to the cross-section, from qualitative to quantitative, go onHuachi-Nanliang region studied Chang6reservoir characteristics. In this thesis, basedon core observation, by petrology, sedimentary structures, such as identificationanalyze the causes of sand deposited thick layers Chang6reservoir and establishdepositional model. On the basis of sedimentary facies analysis, by thin sectionanalysis, porosity and permeability data, mercury analysis, relative permeabilityanalysis to understand the reservoir sandstone diagenesis, pore type, pore structureand flow mechanism, from the microscopic analysis of reservoir sandstonesdistribution characteristics, and controlling factors of reservoir for producing layer tosucceed the late Longdong area, preferably block, increasing reserves and production,to achieve an annual capacity of3million, and exploration and developmentobjectives across the steps to provide a scientific basis for geological, laying a solidgeological foundation.Huachi-Nanliang region of the Chang6reservoir group constructed a total of sixtop surface of the reservoir section are expressed as west-dipping monocline, on thisbackground the construction and development of multiple nose slightly uplift.Sedimentary facies analysis of Chang6reservoir including delta front, gravity flowand semi-deep lake sedimentary system composed of three kinds, the main reservoirsand bodies, including sandy debris flows and underwater distributary channel sand bodies, which Chang6oil thick sand sandy debris flows mainly sand causes. Chang6reservoir rock types are mainly fine-grained lithic feldspathic sandstone, lithicfeldspathic sandstone, sandstone compositional maturity maturity and fillings havesomething zonation, reservoir characteristics of the north and south district, westernthe best sand maturity, the central and eastern part of the worst, the northern region ofreservoir sand bodies better than the maturity of the southern.Chang6reservoir porespace between grains is mainly intergranular dissolved pore, intragranular andintergranular dissolved pore holes, which among the remaining primary intergranularand intragranular dissolved bore hole is the main type. Huachi-Nanliang Chang6reservoir sandstone is mainly in the early and late stages of early diagenetic latediagenetic stage B of A phase. Chang6pore structure characteristics Huachi-Nanliangstatistical point of view, Chang63oil has a lower displacement pressure, maximumthroat radius greater value less stressful, better sorting, and high content of fine throat,but the lower exit efficiency; Chang61oil segment with higher displacement pressure,maximum throat radius smaller, the larger the value of the pressure, poorly sorted,fine jets less content and other characteristics of high efficiency exit; Chang62oilsegment residing between the two. Huachi-Nanliang relative permeabilitycharacteristics indicate that the group is hydrophilic Chang6oil reservoir, has a highcritical water saturation, lower residual oil saturation, oil-water two-phase coexistencenarrow features.