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1. Growth law of conventional proven petroleum-in-place and trend of reserve increase in next 10 years in Jiyang Depression

Author

LI Youqiang, ZHAO Leqiang, GAO Lei, SHANG Bing, FANG Xuqing, LI Jiyan, and HAN Li

Subjects
conventional petroleum, proven petroleum-in-place, growth law, broom-shaped model, reserve increase trend, field with reserve increase, jiyang depression, Chemical technology, TP1-1185, Petroleum refining. Petroleum products, TP690-692.5, Geology, QE1-996.5
Abstract

The conventional petroleum field in Jiyang Depression has always been the main battlefield of exploration and development in Shengli Oilfield. It has experienced more than 60 years of exploration and development and entered the mature exploration stage as a whole， but it still has a relatively large scale of reserve increase every year， which is not consistent with the traditional growth trend of proven petroleum-in-place in oil and gas-bearing basins. The critical issues concerning the exploration decisions of Shengli Oilfield need to be clarified urgently， including the growth law of the conventional proven petroleum-in-place in Jiyang Depression， the strong trend of reserve increase， and the main fields for reserve increase. By analyzing the exploration process of Jiyang Depression， the geological characteristics， resource conditions， exploration investment， theory and technology， resource sequence， and other exploration elements were analyzed， revealing the exploration discovery law of conventional petroleum in Jiyang Depression. The broom-shaped model prediction method and proven rate method of resource were used to predict the growth trend of conventional proven petroleum-in-place. The scale and favorable direction of future reserve increase of conventional petroleum in Jiyang Depression were clarified by analyzing the main fields with reserve increase. The results show that the complex geological characteristics of Jiyang Depression and the relatively abundant remaining resources determine the diversity of exploration objects， the tortuosity of the exploration process， and the long-term nature of exploration history. The conventional petroleum in Jiyang Depression can still maintain a long period of stable reserve increase under conditions of ensuring a relatively stable exploration investment， continuing to innovate the exploration theory and key technologies， and maintaining a relatively reasonable resource sequence. Jiyang Depression can still produce about 2.5 × 108 t of conventional proven petroleum-in-place in the next 10 years under the current economic and technical conditions and the relative guarantee of exploration investment. It is pointed out that the Neogene river sandstone reservoir， lithologic oil and gas reservoirs in the Upper Submember of the 4th Member of the Eocene Shahejie Formation（Es4U）-the Lower 3rd Member of the Eocene Shahejie Formation（Es3L）， and other mature fields are still the ballast stones for stable reserve increase. Kongdian Formation-the deep field of the Lower Submember of the 4th Member of the Eocene Shahejie Formation（Es4L） is an essential field for large-scale reserve increase， and the pre-Paleogene buried hill is a favorable direction for the petroleum enrichment and high yield. In the future， the exploration progress in the unconventional and new energy fields should be closely tracked， and the research results of the growth law and the reserve increase trend of conventional proven petroleum-in-place in Jiyang Depression should be constantly improved and revised to make them more conform to the development trend of oilfield exploration and guide the oilfield exploration decisions.

Published
2024
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2. Particle-size Characteristics and Sedimentary Environment of Dune Sediments in Southwestern Qaidam Basin

Author

Wang Meng, Gao Xuemin, Qu Xin, Liu Zhengxin, and Li Jiyan

Subjects
qaidam basin, sand dune, grain-size, sedimentary environment, Environmental sciences, GE1-350, General. Including nature conservation, geographical distribution, QH1-199.5
Abstract

[Objective] The particle size characteristics and sedimentary environment of dune sediments in the southwest margin of Qaidam Basin were analyzed in order to provide basic data to support sand control and safe operation of the Golmud-Korla Railway. [Methods] We used the particle-size analysis method to determine the particle-size characteristics and sedimentary environment of dunes in the piedmont of the Southwestern Qaidam Basin. [Results] The dunes in the Southwestern Qaidam sand area were mainly composed of fine sand, followed by medium sand. The mean particle-size was between -0.14 Φ and 3.49 Φ, with an average of 2.02 Φ. The sorting parameters varied from 0.32 to 1.59 (with average of 0.66). The skewness distribution was nearly symmetric. The kurtosis was dominated by moderate kurtosis. The natural frequency distribution curves were uni-modal and bi-modal. The cumulative frequency curves were one-stage, two-stage, and three-stage. Mean particle-size and sorting showed a linear correlation relationship, i.e., as mean grain-size became finer, sorting gradually became better. Mean particle-size and kurtosis were negatively correlated when the peak kurtosis value was less than 0.9. In contrast, when the peak kurtosis value was greater than 0.9, mean particle-size and kurtosis were positively correlated. [Conclusion] The northwestern part of the Southwestern Qaidam Basin is an aeolian environment dominated by aeolian sands. The southeastern part of the area is dominated by lacustrine and alluvial-fluvial environments, and the dune sands are affected by the interaction of wind and water.

Published
2022
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