Eastern Chongqing Fly Three Sections Diagenesis And Reservoir

Iff the end of the 20th century, a great breakthrough was made in the explorationof the oolitic beach gas deposit in East Sichuan and the great gas-bearing potentialof the oolitic beach reservoir is realized once again. Owing to extensive distributionof the oolite in T1f3 in West Hubei and East Chongqing, the oolitic beach reservoiris becoming a focus to research in the region. Based on the monographic studies ofdepositional environment and sedimentary facies, diagenesis and pore evolvement,elementary characteristics of the reservoir, the paper endeavored to educecomprehensive appreciation and forecast to oolitic beach reservoir in T1f3 in WestHubei and East Chongqing.The paper analyzed sedimentary characteristics and depositional environment in T1f3 this region firstly, and on the grounds of establishing logical deposit pattern gave emphasis to make a study of distributing laws and spreading traits of the oolitic beach. Because diagenesis is a vitally dominating factor that influenced oolitic beach reservoir nature in the region, the master diagenetic events of the reservoir in the lengthy geological history, as well as the influence to the pore abundance, was made a study of. The diagenetic stages and sequences were divided and the pore evolve pattern was established in the paper. In addition, the research on the spreading of the diagenetic facies was attempted to do at Jiannan structure. At last, through research on the oolitic beach reservoir characteristics in the region, the reservoir in T1f3 was comprehensively evaluated and predicted. Furthermore, the paper contrasted and analyzed the difference of the reservoir nature between the south high spot and the north high spot, as well as, between the region of interest and the East Sichuan so as to achieve more cognition on growing law and forming mechanism of the oolitic beach reservoir and try to provide logical opinions for the exploration and deployment for the future.