Abstract:

Quantitative prediction of reservoir fracture is an important guarantee of development in later period of Keshen-2 Block in Kelasu Structural Belt of Tarim Basin.Based on the description of single well fracture character and the confirmation of paleo- and current crustal stress by structural analysis and inversion matching, mechanical model of research area is built, and numerical simulation of reservoir fracture in Bashijiqike Formation of Keshen-2 Block is carried out combining with the quantitative relationship between crustal stress and fracture parameters.The result shows that fault belts are high value area of fracture parameters, and the top of anticline has low linear density and high aperture, porosity and permeability of fracture while the wing is on the contrary.The reason is that near fault zone the fracture where has high linear density, and the fracture communicate the single sand body.while the high position of anticline where has low linear density,high aperture,weak filling and high effectiveness.The results of numerical simulation has a better matching with single well core fracture and imaging fracture interpretation results.The prediction of fracture permeability of development well is as high as 75%, which provides a basis for the natural gas exploration and development of Keshen-2 Block in Kelasu Structural Belt of Tarim Basin.

Key words: Keshen-2 Block, crustal stress, reservoir fracture, quantitative parameter, numerical simulation