Reserves Evaluation Based on Reservoir Geological Knowledge Database

Abstract

Reservoirs in Sulige gas field are tight and strongly inhomogeneous. The gas reserves calculated with volumetric method is not accurate due to lack of drilling, wireline logging, and well test data in the exploration phase. When the gas field is in the stable production period, more sample data are acquired; thus, we know better about the geological conditions in this area. It is necessary to calculate and evaluate the reserves again. In this paper, with strongly inhomogeneous tight sandstone gas reservoir in He8 and Shan1 member as the researching objective, we put forward the method of recalculating reserves based on database of geological knowledge about reservoir. The database of geological knowledge about reservoir was set up by analyzing reservoir configurations of well network with infilling wells at the gas field. Guided by database of geological knowledge about reservoir, we described the reservoirs thoroughly and divided the reserves calculation units. According to the thought “Dividing the reservoir into units horizontally and minor layers vertically,” we recalculate the reserves adopting volumetric method. Referred to dynamic production condition, cumulative production, abundance of reserves, and internal rate of return (IRR), we classified and evaluated the reserves in this area. According to the evaluation, we further confirmed the resource base of block stable productivity, thus suggested the advantageous targeted block for production construction. In a word, the evaluation method is a guide to the recalculation and comprehensive assessment of strongly inhomogeneous tight sandstone gas reservoir in this paper.

Copyright 2017, Shaanxi Petroleum Society.

This paper was prepared for presentation at the 2017 International Field Exploration and Development Conference in Chengdu, China, 21–22 September 2017.

This paper was selected for presentation by the IFEDC&IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC&IPPTC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC&IPPTC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC&IPPTC. Contact email: paper@ifedc.org or paper@ipptc.org.