Characteristics and distribution of oil and gas reservoirs in the Wulanhua sag of the Erlian Basin

doi:10.3969/j.issn.1672-7703.2020.06.007

Abstract

Abstract: After more than 30 years of exploration in the Erlian Basin, it has become increasingly difficult to discover new sags and oil and gas reserves. In order to further expand the scope of exploration in the basin, the search for new sags has been extended in recent years to the Wenduermiao uplift in the southern margin of the basin, where it has been found that the Wulanhua sag has favorable petroleum geological conditions. Study of the petroleum geological characteristics and hydrocarbon accumulation conditions of the sag have determined that it has a duplex-fault structural pattern. It has experienced an early lake-basin-forming period, frequent episodes of volcanic activity, and strong late tectonic movements. Due to its unique geological conditions, various types of oil reservoirs have formed, such as clastic rock, andesite, and granite buried hill. The hydrocarbon accumulation and distribution laws have been determined, which can be stated as “hydrocarbon accumulation zone in the circum-sub-sag structure, multiple oil-bearing layers in the Paleozoic and Cretaceous, and oil and gas enrichment controlled by high-quality reservoirs”. A composite “multi-layer and multi-type” hydrocarbon accumulation model has been established in the Wulanhua sag, which now effectively guides oil and gas exploration in the sag. Recent drilling operations have discovered an oil and gas reserve replacement area with oil reserves of more than 50 million tons, representing another successful example of petroleum exploration in new areas in the Erlian Basin.

CLC Number:

Xing Yawen, Zhang Yiming, Jiang Shuanqi, Dong Xiongying, Wang Yuanjie, Wang Hongxia, Xu Yongzhong. Characteristics and distribution of oil and gas reservoirs in the Wulanhua sag of the Erlian Basin[J]. China Petroleum Exploration, 2020, 25(6): 68-78.

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