Main Controlling Factors and Modes of Tight Oil Accumulation in Sanzhao Area

doi:10.3969/j.issn.1006-6535.2021.03.008

Abstract

Abstract: In view of the differences in the characteristics and scale of tight oil reservoirs in different tectonic units in Sanzhao area, tight oil accumulation mode of Fuyu oil-bearing formation in each tectonic unit was established by analysis of tight oil accumulation conditions, residual pressure in the accumulation period, fault distribution, sand distribution and physical property characteristics. The results showed that the main driving force of tight oil charging and accumulation in the late period of the Mingshui Formation was the residual pressure formed by hydrocarbon generation and pressurization when the hydrocarbon source rocks matured on a large scale; as an important channel of lateral migration, the three-dimensional conductor composed of fault and sand was a necessary condition for the formation of quasi continuous hydrocarbon accumulation; the local “sweet spot” reservoir under the background of tight oil was a favorable area for tight oil enrichment and high production. Three accumulation modes were established: “overpressure driving and near-source oil and gas backflow” in the northern sedimentary center of the sag, “fault-sand matching and near-source lateral migration and accumulation” in the peripheral slope area, and “fault transmission and distant-source lateral migration and accumulation” in the southern uplift. Accumulation modes and tight oil enrichment rules were different in different regions. This study may provide a geological basis for the selection of tight oil exploration targets in different regions.

Key words: tight oil, main controlling factor, accumulation mode, Fuyu oil-bearing formation, Sanzhao Area

CLC Number:

TE112.1

Bai Junhui. Main Controlling Factors and Modes of Tight Oil Accumulation in Sanzhao Area[J]. Special Oil & Gas Reservoirs, 2021, 28(3): 54-61.

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