Rolling Evaluation on Small Lithologic Reservoirs in Slope Zones: A Case Study on Putaogou-Pubei Structural Zone of Taibei Sag in Turpan-Hami Basin

doi:10.7657/XJPG20200608

Abstract

Abstract:

The trap with lithologic reservoirs in the structural slope zone superimposes local anticlines or nose-like swells on the slope, which is helpful in blocking oil and gas migrating from the lower part of the slope and making them accumulate in the reservoirs. Usually in nose-like swells or cross-beam slopes in a sag, large delta sand bodies are relatively developed, oil and gas accumulation are controlled by the nose-like swell or ridge-like structure. Low-relief structural traps, lithologic traps and structural-lithologic traps are primary places for oil and gas accumulation. Sandstone reservoirs, connected faults and unconformities are primary channels for oil and gas migration. The lithologic reservoirs developed in the Putaogou-Pubei structural zone are far away from the oil-generating sag and are characterized by subtle structure, small amount of well controlling reserves and difficulties in trap identification. To fully understand various accumulation factors and their relationships is of great significance for rolling evaluation on the lithologic reservoirs in the study area. The reservoirs show rapid lateral changes, strong heterogeneity, and complex OWC, which restrict efficient oilfield development. After comprehensive analysis on the structures, oil reservoirs and reservoir physical properties, the laws of hydrocarbon accumulation are summarized, and the hydrocarbon accumulation model is established for the study area.

Key words: Turpan-Hami basin, Taibei sag, small lithologic reservoir, lithologic trap, accumulation model, rolling evaluation

CLC Number:

TE122.322

PAN Haifeng, SHU Kun, ZHAO Ronggang, WANG Jie, HOU Chengcheng. Rolling Evaluation on Small Lithologic Reservoirs in Slope Zones: A Case Study on Putaogou-Pubei Structural Zone of Taibei Sag in Turpan-Hami Basin[J]. Xinjiang Petroleum Geology, 2020, 41(6): 692-696.

Figures/Tables 7

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