Differential Controls of Strike-Slip Faults of Different Orders on Carbonate Reservoirs
Differential spatial structures of the fault-controlled karst reservoirs constrain the efficient development of these reservoirs.The pore structure has been substantially studied for high-order strike-slip fault-controlled reservoirs,but rarely for low-order strike-slip fault-controlled reservoirs.Taking the Fuman oilfield in the northern depression of the Tarim basin as an example,different orders of strike-slip fault-controlled reservoirs were analyzed from the aspects of stress,depositional environment,and lithology,to compare their genesis and differences of pore structure,and the origins and exploration potentials of low-order strike-slip faults were examined.It is found that high-or-der strike-slip faults underwest strong faulting,resulting in an inverted triangular fracture pattern in the reservoir,with a decreasing scale from top to bottom.In contrast,low-order strike-slip faults experienced relatively weaker tectonic stress,leading to a normal triangular frac-ture pattern in the reservoir,with an increasing scale from top to bottom.The fracturing scale induced by low-order strike-slip faults is limit-ed;however,a densely developed fracture network can lead to extensive reservoir fracturing.The primary factors influencing reservoir de-velopment are the depositional environment and lithology.The deep-seated low-order strike-slip faults in the Fuman oilfield can be divided into three zones from west to east,showing significant exploration potential.
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