Abstract:
Sinopec's resource endowment is relatively poor.Various technologies have recently been proposed to improve the quality of seismic data, thereby addressing oil and gas exploration and exploitation issues in key fields, such as the challenging fine description of small-scale subtle traps in the eastern old oilfields, low imaging accuracy of deep and ultra-deep carbonate porous-fractured and cavernous reservoirs in the western oilfields, and low degree of integration in unconventional fields.These technologies include the single-sensor-based high-density seismic acquisition, high-precision imaging of prestack reverse time migration imaging, multi-attribute analysis, and prestack and poststack reservoir inversion.The dominant frequency band of the third member of the Shahejie Formation, that is, the main target layer in the old exploration area of the eastern oilfields, could be widened by more than 20Hz, leading to a significant improvement in the identification accuracy of subtle traps.Thus, the coincidence rate between predictions and drilling results for ultra-deep reef reservoirs in the Sichuan Basin reached 93%.The ultra-deep fault-controlled reservoirs in the Shunbei Tarim Basin were quantitatively analyzed, supporting the deployment of 1000 ton/day wells such as SHB4X and SHB8X.A technology integrating geological, geophysical, and engineering exploration methods for unconventional fields was established at Sinopec.Thus, Sinopec took the lead in exploring the first 10
11 m
3 of normal-pressure shale gas fields in China.Despite the exploration achievements, geophysical exploration activities at Sinopec are still facing four challenges: Ⅰ) technical support for expanding the exploration areas and subsequent well deployment are insufficient; Ⅱ) accuracy of current technologies is insufficient for identifying complex geological targets; Ⅲ) equipments and softwares are strangling the development; Ⅳ) integration among technologies is insufficient.Considering the aforementioned issues that condition the activities in seven key areas (namely the eastern rift basin, deep-ultra deep marine carbonate rock formations, dense clastic rock formations in central and western China, the piedmont belt, unconventional resources, the maritime space, and igneous rock formations), six core technologies should be improved in the future to support the exploration and exploitation; five key technologies should be studied to overcome the bottleneck in technological development; and two cutting-edge technologies should be developed to lead the future technological development.