Characteristics and Controlling Factors of Fractures in Lacustrine Dolostones Reservoirs in Tanggu District
Zhao Yao
Yao Guangqing
Mu Lihua
Li Le
Wang Gang
Abstract：The E1s53 member in Tanggu district is a fault block,high-pressure and fractured lacustrine dolostones reservoirs. Based on the core observation,thin sections and log data with Ansys,the authors study on the causes and formation periods of fractures in lacustrine dolostones reservoirs,describe the fracture characteristics and analyze the control factors of fractures. The results show that the fractures are mainly of the tectonic origin,with a few bedding fractures and dissolution fractures, and the seepage ability decreases successively.There are four stages of fractures development including bedding fractures paral-lel to beddings,oblique fractures with 45 and 60 degrees,tensile fractures with 75 to 90 degrees,and high angel fractures with 70 to 85 degrees.The structure,lithology,diagenesis and overpressure are the key control factors of fractures in lacustrine dol-omite reservoir,which are obviously influenced by cracks and stress field.The fractures mainly develop near the fault cross zone with 2 groups of NW and NE trending faults,and the above mentioned fracture development zone with high pressure called the sweet spots should be valued in oil-gas exploration.
Keywords：fractureLacustrine Dolostonescontrolling factorsTanggu districtpetroleum geology
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 252-264 )