Datapages, Inc.Print this page

A Method Involved Multiple-Point Statistics of Modeling to Paleokarst Fractured-Vuggy Reservoirs

Xiaoqiang, Ma *1; Jiagen, Hou 1; Yuming, Liu 1; You, Zhang 1
(1) College of Geosciences, China University of Petroleum, Beijing, China.

Paleokarst fractured-vuggy reservoirs are a kind of non-stratified reservoirs which have been modified intensely.Considerable development of pores,caves,fractures and severe heterogeneity are the prominent features of this kind reservoirs,and fractured-vuggy unit is the elementary object of reservoirs'production.It's a great difficulty to build a precise model for paleokarst fractured-vuggy reservoirs.Ordovician reservoir of Tahe oilfield located on the north upwelling region of Tarim Basin which is a representative paleokarst fractured-vuggy reservoir is taken as the study object,and a effective workflow has been proposed to map the 3D modeling of such reservoirs.

In the hierarchical framework of planar compartmentalization on karst paleogeomorphy and vertical division in karst zone,Obeying the developmental pattern of paleokarst for guidance and importing the thought of "facies-controlled modeling",we obtained abundant identification data of reservoir by the study integrating cores,well-logs(including image-logs) and rock physics,and combining the physical properties the identification data could be transformed to the "reservoir facies" data,then the method of collaborative stochastic simulation under dual restraints from"reservoir facies"and optimized seismic attributes,e.g.wave impedance,etc was adopted to set up a reservoir-scale 3D model of Tahe oilfield paleokarst fractured-vuggy reservoir.To the inside of fractured-vuggy units,we managed to get the training images via the integrated study on outcrop and seismic facies to characterize complex spatial structure and geometric shape,then made use of the training images to build a more accurate reservoir model by multiple-point statistics.

Synthetical display of two different scale models gets a more detailed characterization to the paleokarst reservoir,and our method of modeling for paleokarst fractured-vuggy reservoirs may be a direction to other similar targets.

 

AAPG Search and Discovery Article #90142 © 2012 AAPG Annual Convention and Exhibition, April 22-25, 2012, Long Beach, California