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- Title
博孜9 井的发现与塔里木盆地超深层天然气勘探潜力.
- Authors
田 军; 杨海军; 吴 超; 莫 涛; 朱文慧; 史玲玲
- Abstract
The Bozi–Dabei Block in the west of the Kelasu tectonic zone in the Tarim Basin is a complex tectonic zone which is characterized by ultra depth, high temperature, ultra high pressure, violent structural deformation and low oil and gas exploration degree. In Well Bozi 9 which is a wildcat well drilled in the Bozi–Dabei Block, a breakthrough has been made recently with a high-yield industrial oil and gas flow produced during a fracturing test. In order to speed up the oil and gas exploration in this block, this paper analyzed the controlling effect of fault grading combination and paleo-structure on structural deformation in the Kelasu tectonic zone. Then, provenance, stress field and hydrocarbon accumulation characteristics of Bashijiqike Formation and Baxigai Formation of Lower Cretaceous were investigated. Finally, the natural gas exploration potential was evaluated. And the following research results were obtained. First, there are four first-order faults in the Kelasu tectonic zone, including Bozi-Kela, Kelasu, Keshen and Baicheng, which form and control four fault tectonic belts. Second, in the west of this tectonic zone develop two paleo-structures (Bozi and Dabei), which began in the Early Cretaceous and five structural models are formed. Third, two sets of sandstone reservoirs of Bashijiqike Formation and Baxigai Formation are developed in the Kelasu tectonic zone. The former is an ultra-deep (7 500 m) quality reservoir, which is under the control of coarse lithology, weak compaction and low stress. The latter is mainly located in the second member and classified as a fractured–porous reservoir of braided river delta front. Fourth, the crude oil in the west of the Kelasu tectonic zone is originated from the source rocks of the Qiakemake Formation of Middle Jurassic, and it underwent two stages of hydrocarbon accumulation, i.e., "oil accumulation in the early stage of and gas accumulation in the late stage". The dry gas in the east is mainly derived from the source rocks of the Huangshanjie Formation of Upper Triassic in the pattern of one-stage hydrocarbon accumulation. In this way, the hydrocarbon accumulation characteristics of dry gas in the east and condensate gas in the west are formed. In conclusion, a favorable trap with natural gas resources of more than a trillion cubic meters is developed in the Bozi–Dabei Block, a series of gas reservoirs with resources of hundreds of billions cubic meters (e.g. Bozi 9) have been discovered and oil and gas breakthroughs have been realized continuously. In addition, the Bozi–Dabei major gas area with resources of one trillion cubic meters will be implemented in the near future.
- Subjects
NATURAL gas prospecting; PETROLEUM; PETROLEUM prospecting; NATURAL gas; BRAIDED rivers; HYDROCARBON reservoirs; GAS reservoirs
- Publication
Natural Gas Industry, 2020, Vol 40, Issue 1, p11
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2020.01.002