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Study On The Heterogeneity And 4-Dimensional Reservoir Model Of The Nearshore Subaqueous Fans System

Posted on:2010-02-21Degree:DoctorType:Dissertation
Country:ChinaCandidate:K YanFull Text:PDF
GTID:1100360278960768Subject:Geological Resources and Geological Engineering
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This paper took the nearshore subaqueous fans system in the 4th member of Shahejieformation in T123 Block of Shengtuo oilfield for example. By using the theory of reservoirgeology and comprehensive data including seismic, geology, log, production test anddevelopment performance, the paper elaborated systematically the theory, approach andtechnique about the heterogeneity and 4 dimensional reservoir model of nearshoresubaqueous fans system in the steep slope belt of rift basin.The study combined the static and dynamic research on the nearshore subaqueous fanssystem, developed the sedimentary characterization, architectural element, log analysis andevaluation, hierarchical heterogeneity characterization, evolutionary pattern of the reservoirparameter in depth. As an innovative outcome, the paper revealed the heterogeneity andevolutionary pattern of the nearshore subaqueous fans system in T123 Block of Shengtuooilfield, built a 4 D reservoir model, and form a series theory and method about theheterogeneity and dynamic evolution of nearshore subaqueous fans system.The paper achieved some innovational scientific payoffs. Main achievements of thestudy are summarized as following:(1)The principle and technical path of the geologic correlation about nearshoresubaqueous fans system has been proposed, which overcome the defects of the lithologiccorrelation. According to the facies controlled correlation, the delicate strata framework of thenearshore subaqueous fans system has been built.(2)Based on the research of sedimentary characterization, the new sedimentation modelof the nearshore subaqueous fans has been established, which genesis coincided with thedensity current.(3)The architectural element of the nearshore subaqueous fans has been identified anddivided. On the base of architectural element research, the cyclicity and stage of the nearshore subaqueous fans have been characterized delicately. The method to identify the architecturalelement by log attribute also has been draw up, and the geological model of the architecturalelement has been built to show us detailed feature of the nearshore subaqueous fans visually.(4)The log interpretation model fitted for glutenite reservoir of the nearshore subaqueousfans has been established. The accuracy degree of reservoir parameters which figured out bynew log interpretation model was higher than other interpretation model before.(5)A new system to characterize the heterogeneity hierarchically was worked out. As animportant part in this system, a new parameter based on the research about the permeabilitycumulative distribution was proposed to characterize the macroscopic heterogeneity degreequantitatively, named as coefficient of heterogeneity degree. According to the new system, theheterogeneity of the nearshore subaqueous fans has been characterized hierarchically in thescale of microscopic, one dimension, two dimension, three dimension and four dimension.(6)Amethod to study the evolutionary model of reservoir parameters has been developedinitiatively. Suffered secular waterflood development, the properties of heterogeneousreservoir would be changed. The variance of reservoir properties between different stages isdecided by the degree of water drive in the same flow unit, and the subsequent reservoirproperties is a function of original reservoir properties and degree of water drive. A series ofdynamic evolution data of reservoir properties can be obtained by delimiting the dynamicwell pattern unit, tracing the change of well pattern and development performance, andcharacterizing the degree of water drive quantitatively. The mathematical evolutionary modelof reservoir properties can be achieved by using of multivariate regression analysis.(7)According to the mathematical evolutionary model, the reservoir properties in anytime after exploitation can be figured out, and the 4 dimensional reservoir model based ondevelopment performance has been set up by PETREL.(8)A new method was proposed to evaluate reservoir development effectiveness. Basedon the law of Pareto, a series of individual well deliverability sequence over the years can beestablished, and the effectiveness of development can be analyzed qualitatively and evaluatedquantitatively by means of the correlation between the degree of reserve recovery and the rateof change of deliverability size which derived from the linear regression of individual welldeliverability sequence. The principle of this method for evaluating effectiveness of reservoir development is different from other one based on reservoir engineering and can be enrichmentfor present evaluation system of reservoir development.(9)Utilizing the numerical reservoir simulation and comprehensive evaluation index, Thepattern of the remaining oil distribution in the region of interest has been studied. Combinedwith the saturation distribution of remaining oil in the 4 D reservoir model, a comprehensiveevaluation about remaining oil distribution was made, which can be use to guide the reservoirdevelopment and adjustment.(10) The development & adjustment program of the nearshore subaqueous fans reservoirin T123 Block has been optimized by using of the 4 D model, which had achieved satisfiedeffect both in technique and economy. According the development performance and tendencyof the adjusted reservoir, the 4 D model has been updated to guide the developmenteffectively.
Keywords/Search Tags:Nearshore Subaqueous Fans, Sedimentation Model, Architectural Element, Reservoir Heterogeneity, Evolutionary Pattern, 4 D Model
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