Reservoir Characteristics Of Bedrock Buried Hill In Nanbeier Depression

Nanbeier depression in Haita Basin Central faulted belt is an important exploration sag,located in Mongolia of Tamtsag Basin, exploration area of about3500km2, topography, EastWest High low north south high-low trend. In recent years the exploration in bedrock foundgood oil and gas shows in buried hill, bedrock geologic conditions are complex, the deepgeological understanding and exploration degree is not high, not on reservoir pore-holegapdistribution have sufficient knowledge, as soon as possible in order to increase the pace ofexploration, need to increase efforts to the deep reservoir of buried hill. In this paper, throughthe study on the comprehensive utilization of all kinds of geological data of study area, thegeological conditions of rock buried hill conducts the analysis research. Mainly analyzed thebedrock reservoir lithology, physical properties and into the rock, and divided into rocksequence and rock phase, and for the first time using the curvature method, the finite elementnumerical simulation method of rock fracture distribution situation analysis and prediction,combine the research pointed out that the favorable reservoir exploration area.Nanbeier depression bedrock Buried hill reservoir mainly has two kinds of lithology,respectively volcano clastic rock and clastic rock. The clastic lithic feldspar sandstone,followed by feldspar lithic sandstone. Nanbeier depression depression rockporosity-permeability value change is bigger, the value of porosity for an average of6.2%,belongs to low porosity; permeability for an average of0.58x10-3m2, overall belongs to lowpermeability. Clastic rocks in into the compaction, cementation, filling the role of destructionof the reservoir space, the effective reservoir formation have negative effects, whilemetasomatism, dissolution and fracturing of secondary pore formation have positive influence.Volcano clastic tuff, tuffaceous sand including (gravel) rock, sedimentary tuff, the rocksmainly include mechanical compaction, mechanical filtration, devitrification, alteration,cementation. Nanbeier depression bedrock reservoir mainly into rock stage for a rock stage B.Based on the comprehensive evaluation of reservoir that, South Baer in East concaveSouthern groove, main development II, III reservoir, West concave Southern groove of themain development of class III reservoir, Nanbeier depression in southern Buried hill drapebelt mainly developed type IV reservoir.