高校地质学报2018，Vol.24Issue(3)：412-424,13.DOI:10.16108/j.issn1006-7493.2017112
致密砂岩气藏储渗单元研究方法与应用:以鄂尔多斯盆地二叠系下石盒子组为例
Research Methodology and Application of Reservoir Permeability Units for Tight Sandstone Gas Reservoirs: A Case Study in the Permian Lower Shihezi Formation of the Ordos Basin
摘要
Abstract
Detailed investigation of reservoir characterization and architecture is the main technique requirements for the development of tight sandstone gas reservoir in the middle-to-later stage. Based on the similarities of porosity and permeability for different types of sand bodies, channel-filling and channel bar of braided river sedimentary system were classified into the same reservoir permeability unit. Concept and methodology of such permeability units were put forward and the developmental model in the unit was studied. Through outcrop observation and analysis of logging facies, four superimposed patterns within the unit were identified, including channel bar superposition, channel filling superposition, bar and channel filling superposition, and bar or channel filling isolated types. Based on developmental patterns of the units, well types suitable for the development of tight sandstone gas reservoirs were proposed. Channel superimposed belts in braided river sedimentary system are favorable for the development of superimposed permeability units and horizontal drilling. The transition and depression zones of braided river sedimentary system are favorable for the development of isolated permeability units and vertical or cluster wells. Case studies in the Low Permian Shihezi outcrops of the Ordos Basin and interference well tests in the pilot infill areas of the Sulige gas field show that permeability units of braided river sedimentary system have a length of 600 m along the paleocurrent and width of 400 m perpendicular to the flow direction. This implies that the well pattern in the Sulige gas field has the potential to be infilled into inter-well distance at 400 m and well array at 600 m, with an increase of recovery factor by 15% to 20%.关键词
致密砂岩气藏/辫状河沉积体系/储渗单元/叠置模式/开发井型/采收率Key words
tight sandstone gas reservoirs/braided-river sedimentary system/reservoir permeability unit/superimposed patterns/types of well production/recovery factor分类
天文与地球科学引用本文复制引用
郭建林,贾成业,闫海军,季丽丹,李易隆,袁贺..致密砂岩气藏储渗单元研究方法与应用:以鄂尔多斯盆地二叠系下石盒子组为例[J].高校地质学报,2018,24(3):412-424,13.基金项目
国家科技重大专项"大型油气田及煤层气开发"(2016ZX05015)资助 （2016ZX05015）
