Main controlling factors and favorable area prediction of tight sandstone oil formations in the Niuxintuo Es4 member in the Liaohe Depression
PANG Hong, WU Song, HU Yingjie, WANG Haipeng , DING Xuguang, LIU Xingzhou , XI Shasha, CHEN Chang , GUO Junmin
1 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China 2 Basin and Reservoir Research Center, faculty of Earth Sciences, China University of Petroleum-Beijing, Beijing 102249, China 3 Exploration and Development Research Institute of PetroChina Liaohe Oilfield Company, Panjin 124000, China 4 Production logging project department of Liaohe Branch, District Xinglongtai, Panjin 124000, China
The degree of exploration of the fourth member of the Shahejie Formation in the Niuxintuo area is low, but the exploration prospects are good. Previous studies generally believe that the sandstone reservoirs in the fourth member of the Shahejie Formation are mainly conventional structural and lithological reservoirs, and the source controlled reservoir forming model of the fourth member of Shahejie formation is established, and it is pointed out that the structural high point and the vicinity of faults are favorable places for oil and gas enrichment. However, a recent study by the author’s team found that the sandstone reservoirs of the fourth member of the Shahejie Formation in the study area are generally tight. It is significant to study the main controlling factors of tight oil formation and the prediction of favorable areas for future exploration in the study area. Based on the analysis of 30 wells and 4103 test data (including 264 geochemical data of hydrocarbon source rocks, 2624 physical property data of
reservoirs and 55 pressure data), the formation conditions of tight oil in the fourth member of the Shahejie Formation in the study area are analyzed by using the method of functional element combination, the main controlling factors of tight oil formation are clarified, and the distribution range of favorable zones is predicted. The results show that the sandstone of the fourth member of Shahejie Formation in the Niuxintuo area has the characteristics of low porosity enrichment, low pressure stability, close source to reservoir distance and contiguous enrichment, and has the conditions for the formation of tight oil. The formation and enrichment of tight oil are controlled by the reservoir and source rock. In addition, the fourth member of the Shahejie Formation in the Niuxintuo area has medium porosity (5% <Φ< 12%), with the best oil and gas potential and the source rock potential of the Niuxintuo sub member is the largest. It is found that the distance between oil and gas reservoirs and the hydrocarbon expulsion center is less than 10 km. According to the T-DPS distribution and development model (T: Time; D: Sedimentary facies; P: structural stable zone; S: source rock), the dense oil-favorable zone is measured. The most favorable zones (porosity is 6% - 10%) are located in the Tuo 43-Tuo 16 well block, north of the Tuo 605-Tuo 24 well block, and the middle of the Tuo 45-Tuo 25 well block. The secondary favorable areas are located in Tuo-1, Tuo-602 and Tuo-21-Tuo-15. The research results indicate the direction of exploration and development in the study area.
Key words：
Niuxintuo area; the fourth member of Shahejie Formation; tight oil; main control factors; favorable zone prediction
PANG Hong, WU Song, HU Yingjie, WANG Haipeng, DING Xuguang, LIU Xingzhou, XI Shasha, CHEN Chang, GUO Junmin. Main controlling factors and favorable area prediction of tight sandstone oil formations in the Niuxintuo Es4 member in the Liaohe Depression. Petroleum Science Bulletin, 2020, 04: 467-482.
