We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
鄂尔多斯盆地陇东地区二叠系太原组铝土岩系储层 特征及勘探意义.
- Authors
姚泾利; 石小虎; 伟伟; 张雷; 解丽琴; 安文宏; 王慧玲; 张仁燕
- Abstract
Recently, a breakthrough has been made in the gas exploration of the bauxite rock series from the Permian Taiyuan Formation in the Longdong area, southwestern margin of the Ordos Basin, introducing a new field of gas reservoir exploration. As a new type of reservoir, the study of the bauxite rock series reservoir has significant research value. In this study, based on core observation, well logging, earthquakes, rock slice analysis, whole rock analysis by X-ray diffraction and scanning electron microscope-energy spectroscopy, high pressure mercury injection, low temperature nitrogen adsorption and other experimental methods, the petrological and pore structure characteristics of bauxite reservoirs were systematically studied. Furthermore, the main control factor and exploration significance of bauxite reservoirs in the basin is expounded. The results show that: (1) the lithologic sequence is characterized by three segments in the vertical direction. The upper and lower parts are composed of bauxitic mudstone, the middle part is composed of bauxite, and the solution pores are well developed in the main reservoir section of the bauxite rock series; (2) The main mineral composition of the bauxite rock series from the Taiyuan Formation is bauxite and clay minerals, the main minerals are diaspore, kaolinite, illite and chlorite, and the crystals are small, primarily cryptocrystalline, microcrystalline and cryptocrystalline masses; (3) the bauxite reservoir spaces are primarily composed of intragranular solution, matrix solution, intergranular dissolution, and intercrystalline pores and microfractures. The pore size ranges from 20 to 200 μm. The pore size of the mainstream throat ranges from 150 nm to 4 μm, and has better pore structure and high mercury removal efficiency. Overall, the pores are primarily sub-micron and micron pores. The average porosity and permeability of the reservoir are 10.6% and 4.04×10-3 μm2, 36% of which are larger than 0.3×10-3 μm2, and the reservoir performance is good. (4) Sedimentary environment and paleogeomorphology control the distribution of bauxite reservoir. Buried pit and terrace micro-paleogeomorphology enrich bauxite and are the main favorable exploration areas. The bauxite reservoir distribution is controlled by the sedimentary environment and palaeogeomorphology, and bauxite is enriched by buried pits and terrace micro-paleogeomorphology, and favorable areas are relatively developed. The research results can provide reference for the exploration of bauxite natural gas in North China and other areas.
- Publication
Acta Sedimentologica Sinica, 2023, Vol 41, Issue 5, p1583
- ISSN
1000-0550
- Publication type
Article
- DOI
10.14027/j.issn.1000-0550.2022.034