Impact of Burial Dissolution on the Development of Ultra‐deep Fault‐controlled Carbonate Reservoirs: Insights from High‐temperature and High‐pressure Dissolution Kinetic Simulation

Abstract

AbstractBurial dissolution is a critical diagenetic process influencing ultra‐deep carbonate reservoir development and preservation. Artificial carbonate samples with different internal structures were prepared, and high‐temperature and high‐pressure dissolution kinetic simulations were conducted. The results demonstrate that the intensity of burial dissolution is controlled by temperature and pressure, while tectonic‐fluid activity influences the development pattern of burial dissolution, ultimately determining the direction of its differential modification. Extensive burial dissolution is likely to occur primarily at relatively shallow depths, significantly influencing reservoir formation, preservation, modification, and adjustment. The development of faults facilitates the maintenance of the intensity of burial dissolution. The maximum intensity of burial dissolution occurs at the tips and overlap zones of faults and intersections of multiple faults. The larger the scale of the faults, the more conducive it is to the development of burial dissolution. Burial dissolution fosters the formation of fault networks characterized by enhanced reservoir capacity and permeability. Burial dissolution controlled by episodic tectonic‐fluid activity is a plausible explanation for forming the Tarim Basin's ultra‐deep fault‐controlled “string‐bead‐like” reservoirs.