High-resolution Sequence Contrast and Its Oil/Gas Exploitation Significance of Lower Sand Section of Kumugeliemu Group of Quele-Yangta Well District in Kuqa Depression

Abstract

Abstract:

High-resolution sequence stratigraphy provides an important method for reservoir finely contrast in dense devoloping well area. Bounded by the relatively steady transgrassive surface, there can be divided 4 4th order sequences and 6 5th order sequences in the lower sand section of Kumugeliemu Formation. Finely sequence contrast and depositional microfacies analysis show that there were mainly delta front deposit of drought salt lake environment in Yangta developing district, and formed 3 to 4 steady distributional fine grainsize sands, which came from eastern and southeastern uplift area, and reflected the fluvial long-distance transportation. In Quele developing district, the sandbody was thicker variable, which reflected the near fan or braided fluvial delta deposit characteristic. Three thick sandbodies wich are in braided channel, delta front mouth bar and subdistributary channel developed during 3 transgressiveregressive cycles can be recognized. From the northwestern to the southeastern, the sand gradually thinner, and reflected the clastic system coming from western Wensu uplift. Paleo-geography restructure shows that the two well districts developed under two different depositional systems, and there was a bay between them. The difference of sequence and depositional system decided the reservoir distribution and oil field development scheme.

Key words: high-resolution sequence stratigraphy, depositional system, oil field development, the lower sand section of Kumugeliemu Formation, Quele and Yangta developing district;Kuqa depression

CLC Number:

TE121.3

CAI Zhen-Zhong, ZHANG Li-Juan, LIN Chang-Song, LEI Yan-Ping, SU Zhen-Zhen. High-resolution Sequence Contrast and Its Oil/Gas Exploitation Significance of Lower Sand Section of Kumugeliemu Group of Quele-Yangta Well District in Kuqa Depression[J]. Geoscience, 2010, 24(4): 662-668.

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