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The Difference Of Hydrocarbon Fullness Between Turbidity Sand Reservoirs In Bonan Sub-sag

Posted on:2012-03-12Degree:MasterType:Thesis
Country:ChinaCandidate:R J LiuFull Text:PDF
GTID:2120330338493462Subject:Geology
Abstract/Summary:PDF Full Text Request
The difference of hydrocarbon fullness between turbidity sand reservoirs in Bonan sub-sag is obvious, and there are many complex factors control this difference which are interactional, but in research region, this difference is controlled by reservoir properties and reservoir-forming dynamic. This thesis analyzed turbidity sand reservoirs and the reservoir-forming dynamic subtly, chosen the primary controlling factors and established an expressions between the hydrocarbon fullness and the primary controlling factors. This thesis researched the reservoir more subtly by compartmentalizing andcontrasting the reservoir on the scale of thin layer, compartmentalized 30 thin layers. On the section plane, the turbidity sands are superimposed. The thickness and connectivity of every group's sands are different, but the group 9 is best. On the plane, the shape of the turbidity sands mostly are potato-like, secondly are banding-like and sheet-like. The reservoir physical property is middle-low porosity and low-lower permeability in the research region. This area's rock types are mainly debris-feldspar. The factors of influencing and controlling the reservoir physical property are median grain diameter, cement content, matrix content. The reservior space are mostly the secondary porosity. The types of pore throat are fine, finer, micronic pore throat.Overpressure is the reservoir-forming dynamic in the research region because of the research layer are on the belt of overpressure. This thesis using the method of"equivalent depth"to calculate the pressure of different depths, combined the research region, we have this result: The position of pressure center are mainly in the deep depression and the pressure is decreased from deep depression zone to slope zone. Both the unconformity and faults have negative influence on the distribution of pressure. The resistance force of reservoir-forming is capillary pressure and the micronic pore throat have the biggest capillary pressure. So this thesis made an expressions between reservoir penetrability and capillary pressure to calculate capillary pressure of every sand.Combing the shape of sand body, distribution of sands, reservoir physical property, dynamic and resistance force of reservoir-forming of every sand with the hydrocarbon fullness of turbidity sand reservoirs, we have the results below. The factors which have a positive correlation with the hydrocarbon fullness are the thickness of sands, effective thickness of sand body, reservoir physical property, dynamic force of reservoir-forming. The factos which have a negative correlation with the hydrocarbon fullness are length-width ratio of sand body, resistance force of reservoir-forming. Choosing thickness- effective thickness ratio, porosity, the difference between dynamic and resistance force of reservoir-forming, combined with the hydrocarbon fullness of turbidity sand reservoirs to establish an expressions and validated the veracity of the expressions.
Keywords/Search Tags:Bonan sub-sag, Turbidity sand, Hydrocarbon fullness, Reservoir physical property, Distribution of turbidity sand, Reservoir-forming dynamic
PDF Full Text Request
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