西南石油大学学报(自然科学版)

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Geological Modeling of Effective Sandstone Reservoir of the Su-6 Infilling
Drilling Pilot in Sulige Gas Field

Shi Shi1*, Gao Lixiang2, Liu Lili3, Gu Jiangrui1, Bi Mingwei2   

  1. 1. Langfang Branch,Exploration and Development Research Institute,PetroChina,Langfang,Hebei 065007,China;2. School of Geosciences,China
    University of Petroleum(Huadong),Qingdao,Shandong 266555,China;3. Sulige Research Center,Changqing Oilfield Company,PetroChina,
    Xi´an,Shannxi 710021,China
  • Online:2015-02-01 Published:2015-02-01

Abstract:

Upper Paleozoic gas reservoir in Sulige Gas Field has the typical“thick sand layer but thin effective reservoir”
feature,effective reservoir is mainly lenticular,with complex spatial distribution,which increases the difficulty of geological
modeling because of its reservoir heterogeneity. A new method of geological modeling aiming at this type of reservoir is put forward
in the Su-6 infill drilling pilot based on both static and dynamic constraint. First,the facies model which can better reflect
the heterogeneity of reservoir was established on the basis of fine sedimentary facies research controlled by both deterministic
and stochastic modeling method. The facies model is a static constraint of reservoir distribution range and direction. Secondly,
the uncertainty of effective reservoir spatial distribution was analyzed on the basis of statistics on the flow discharge of single
well radius obtained from single well production performance analysis. Finally,in order to realize the random simulation of
dynamic and static constraints on the effective reservoir,the distribution range of the effective reservoir was arranged under the
control of sedimentary facies model and the radius of the single well flow discharge,and the space distribution probability of
effective reservoir was given in each layer. Comprehensive analysis reveals that the effective reservoir model accords with the
geological knowledge,and the dynamic analysis of the well connectivity very well. Compared with the conventional methods
of effective reservoir modeling,success rate of production history matching increased by 43%.

Key words: effective sandstone reservoir, reservoir geological modeling, sedimentary facies, dynamic constraint, Sulige Gas
Field,
evaluation of the uncertainty, production history fitting