Characteristics and reservoir-control effect of Upper/Middle Permian unconformity structures in the east of Fukang Sag, Junggar Basin
TANG Yong1, JI Jie2, GUO Wenjian1, CHEN Hong1, LI Yan-ying3, DONG Fang3
1. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 831000, China; 2. School of Ecology, Resource and Environment, Dezhou University, Dezhou, Shandong 253023, China; 3. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China
Abstract：The high porosity and permeability zones in longitudinal structures of unconformity and the reservoir-cap combinations composed of different structural layers can form various types of litholo-gic stratigraphic traps. Therefore, through the combination of logging and seismic data and the integration of the upper and lower seismic reflection characteristics of unconformity, the Middle/Upper Permian unconformity in the east of Fukang Sag in Junggar Basin are divided into five types: parallel-parallel, parallel-cut, parallel-fold, overlap-cut, and overlap-fold. The logging data is used to construct the determinant parameter to identify unconformity structures and analyze their development laws and controlling factors. Then, the reservoir-control model of unconformity structures is built on the basis of the drilling results. The research reveals that the unconformity structures are mainly controlled by the erosion amount, lithology of mother rock, and the depth of the structures, and the thickness of the upper layer is negatively correlated with that of the intermediate layer in the unconformity structures. The unconformity area of overlap-cut is a favorable zone for developing oil and gas reservoirs. The water in the unconformity superstructure entering the sand body is a favora-ble target for oil and gas exploration of unconfor-mity, and it is easy to form stratigraphic overlying oil and gas reservoirs in the lake (sea) bay area. The research result can provide a reference to the exploration of unconformity reservoirs in other similar areas.
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