Internal Configurations Of Fault Zones And Its Geological Significance

It is said that faults are hydrocarbon migration channels or hydrocarbon migration barriers.The study on the internal structure of fault broken zone is little.Fault is composed of induced fractures and section fillings.Current research on fault broken zone is mainly through the field geological profile description,so the research on the underground fault broken zone is a big problem.As result,the features of underground fault broken zone and geological significance of it are unknown.The observations and descriptions based on the Rock core of he 68-oblique Well provide a sample which induces fracture fillings log response characteristics.It is found that broken fault zone has high acoustic time(cycle jumping phenomenon),high neutron porosity and density logs and so on.The section fillings have low coustic time,neutron porosity curves gently and samll density curve without expanding.The data of cracks on the intersection graph is CAL>12,RTC>0.2,AC>97,DEN<2.15,CNL>21.The identification index of fault boken zone P values greater than 0.3,while the surrounding rock P values less than 0.3.There are four types of fault fracture zone in Xin-1 fault blocks: structural symmetry fault fracture zone,structural asymmetry fault fracture zone,induced fractures fault fracture zone and fault fracture filling section belt.The boken fault zone in Xin-1 fault blocks has been evaluated.It is induced fracture segment porosity,permeability larger,with good transport conductivity,filling row section segment porosity,low permeability,section fillings pressure was significantly greater than for the upper and lower plate displacement pressure reservoir has good lateral sealing properties.The internal structure of fault broken zone subject to fault occurrence,mechanical properties and activities as well as the strength of faults affecting lithology fault.The fault broken zone is composed of lithological units,physical differences,which leads that different structural types of the fault fracture zone in hydrocarbon migration.We should design development wells based on the distribution characteristics of different fault broken zone in order to improve the recovery of oil.