Reservoir Property Study Of Chang2Oil Layer Of Yanchang Formation Of Quan63Wells Region In Xiasiwan Oilfield

Quan63wells region is located in the north of Erdos Basin of Xiasiwan oilfield, the mainobjective layers is the Triassic Chang2reservoir, the reservoir heterogeneity is serious, is stillin the stage of development of natural energy, for the realization of the reservoir efficientdevelopment, reservoir characteristics of the area is necessary for a more in-depthunderstanding for the future to develop the right policies waterflood development programsand provide technical geological basis.In this paper, the reservoir geology, petrology, sedimentology and modern reservoirdescription method and technology, application of drilling, geology, logging, testing andanalysis of production data, the reservoir petrology, diagenesis, pore structure, physicalproperty, the sensitivity of the reservoir, the reservoir seepage and fracture characteristics ofreservoir is systematically integrated research and evaluation, made the following conclusionsand understanding.Research Chang2reservoir structure is characterized by a gentle west-dippingmonoclinic, monoclinic background in the west-dipping NE-SW developed on three rows ofnose to swell; reservoir sand bodies are mainly fluvial facies, microfacies to dam the river andfloodplain micro-oriented; reservoir lithology is mainly fine-grained feldspathic sandstone,lowcompositional maturity, structure and high maturity; reservoir compaction pressure occursmainly dissolved, cementation, metasomatism, dissolution role of diagenesis and pore typesare mainly residual intergranular pores, intergranular dissolved pores; average porosity of13.5%, average permeability of4.5×10-3μm2, good physical properties compared to theadjacent areas; layer showed no sensitivity of velocity sensitivity, weak salt sensitivity, weakalkali-sensitive and water-sensitive, weak acid sensitivity; natural fractures is developed tovertical fracture mainly with nasal fracture azimuth axis toward Long nose basic structureconsistent. According to Integrated Reservoir Characteristics and Ordos Basin reservoirsgrading standards, the head of two reservoirs is Ⅲ low porosity-low permeabilityreservoirs.