Genesis relationship between faults and karst reservoirs in the Yingshan formation,Medieval No.8 wellblock
LI Jing-rui
LIANG Bin
YU Hong-feng
ZHANG Qing-yu
CAO Jian-wen
DAN Yong
HAO Yan-zhen
LI Jie
Abstract：There are abundant oil and gas resources in the Ordovician carbonate formation of the Tarim ba-sin.The superposition and transformation in many episodes of different types of karst development are the main driving force of Tazhong ancient karst reservoirs.Faults are an important factor affecting karst reser-voirs.The Medieval No.8 wellblock is situated in a northwest-southeast trending thrust fault zone of the Caledonian period and a northeast-southwest trending strike-slip fault zone of the Hercynian period,which form a network system.The karst reservoirs developed in the subsurface from the top of Yingshan formation to 120 km depth,which are of hole type,cavity type,fissure type and fissure-hole type.Of these,the fis-sure-hole type and hole-type are dominant.The multi-episode faults and associated fissure network system of the Caledonian to Hercynian period serve as good migration channels for fluids,which promote the develop-ment of the fissure-hole system,burial dissolution and dolomitization,improving the performance of reser-voirs to become a complex combination of carbonate holes,cavities and cracks.
Keywords：karst reservoirfaultkarstificationYingshan formationMedieval No.8 wellblock
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 147-153 )