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The Study Of Characteristics And Heterogeneity In Jurassic Reservoir, Malang Depression, Santanghu Basin

Posted on:2009-04-07Degree:MasterType:Thesis
Country:ChinaCandidate:Y H LiuFull Text:PDF
GTID:2120360242484033Subject:Oil and gas field development project
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Under the guidance of new principles and methods of Sedimentology, Sedimentary Petrography and Reservoir Geology, this thesis takes the terrigenous clastic reservoir of Malang depression Santanghu Basin as the main object of study.Through the study of the core observation, sediment characteristics, sedimentary structures, and structural characteristics ,the area formed three sedimentary system,six sunfacies and seven microfacies. The fluvial-diversion of the fan delta in the bottom of the Xishanyao Formation and the subquatic fluvial-diversion of the fan delta in the upper of the Qigu Formation are the favouriate reservoir zone. The reservior lithology characteristic shows low texture,low degree of compositional maturity.The constitution belongs to arkose quartzite and lithic sandstone.the porosity and permeability of the oil-bearing layer of reservoir display normal distribution,and then the overall characteristic is mid permeability and low porosity. The main type of pore is primary origin and residual intergranular porosity.the pore feature is micropore ,microthroat,weak skewness and poor gradation. The main diagenesis in the studied area included the mechanical compaction, cementation, infilling, dissolution, and authigenic mineral precipitation. The diagenesis of the reservoir sandstone is during the period of the early compaction cementation and late diagenesis A , Accroding to the phase of the Organic evolution and the PH of its intergranular water, the diagenetic environment can be divided into two types: acidic and alkali environment.Acoording to the sensitivity of fluid , the damage way of the reservoir and the content of the clay minerals, the reservior can be divided into three types: water sensitive reservior,acid sensitive reservior and velocity sensitive reservior. Reservoir heterogeneity is obvious ,different sedimentary facies has much difference. In general,the channel sandstone of the delta front is the better area for the reservoir than the moss land. There are three influence factor on the reservoir heterogeneity: sedimentary environment,lithology and diagenesis.among them ,the most important factor is diagenesis. The constructive factor is dissolution and the destructive factorinclude cementation and mechanical compaction.
Keywords/Search Tags:Reservoir Characteristic diagenesis, diagenetic environment, Jurassic Reservoir, Malang depression
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