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Favorable Sandstone Reservoir Characteristics and Hydrocarbon Accumulation Models of Middle Jurassic Zhiluo Formation in the Southwestern Ordos Basin, China(PDF)


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Favorable Sandstone Reservoir Characteristics and Hydrocarbon Accumulation Models of Middle Jurassic Zhiluo Formation in the Southwestern Ordos Basin, China
CHEN An-qing1 ZHANG Xiao-xing1 MI Wen-tian2 KANG Yong-mei3 LIU Yi-cang3 WANG Lian-guo3 DU Jia-ning3 HOU Ming-cai1 MIAO Zong-li1
(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. College of Mining, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 3. No.11 Oil Production Plant, Changqing Oilfield Company, PetroChina, Qingyang 745000, Gansu, China)
source-sink system paleogeomorphology source sedimentary facies reservoir hydrocarbon accumulation Zhiluo Formation Ordos Basin
Middle Jurassic Zhiluo Formation in the southwestern Ordos Basin is a new potential exploration target with low degree of exploration. Based on outcrop and core observation, interpretation of logging data and thin sections identification, the paleocurrent and paleogeomorphology were reconstructed to reveal the distribution of paleo-drainage system; based on the logging interpretation of more than 500 boreholes, combined the constraint of paleogeomorphology and paleo-drainage, the macroscopic dispersion system of sandbody and the distribution of sedimentary facies were proposed. The results show that the source of Zhiluo Formation in the southwestern Ordos Basin is mainly from West Qinling orogenic belt in the southwest; the supply of sand is abundant in early, and the sedimentary environment is braided river-braided river delta, which builds grey thick sandstone intercalated with mudstone; then the supply of source changes to fine grains dominated, and the sedimentary environment turns into meandering river delta characterized by the development of purple mudstone with sandstone interbed; sandstone reservoir of Zhiluo Formation is dominated by primary intergranular pores and dissolution pores, and the porosity is 0.87%-31.20% with the average of 16.34%, the permeability is(0.13-53.70)×10-3 μm2 with the average of 17.83×10-3 μm2, the lowest porosity-limit of effective reservoir is 15%; in the early deposition of Zhiluo Formation, the paleogeomorphology not only controls the development and distribution of sandbody, but also influences the advantageous position for the development of sandbody and the direction of hydrocarbon migration subsequently; potential reservoir targets include three types of hydrocarbon accumulation models related with paleogeomorphology, that is, highlands in upstream, curved slop toe in midstream and interriver mound in downstream.


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Last Update: 2019-09-19