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- Title
走滑断裂断控碳酸盐岩油气藏的特征与井位部署思路: —以塔里木盆地为例.
- Authors
邓兴梁; 闫 婷; 张银涛; 万效国; 冯 凯; 袁安意; 姚 超; 肖春艳
- Abstract
Carbonate oil and gas reservoirs in the Tarim Basin are one of the important fields of deep oil and gas exploration and development in China. In recent years, the exploration targets in this basin have gradually shifted to the northern depression which is mainly controlled by faults. However, the efficient development of oil and gas in this area is hampered by the unclear mechanisms of fault controlled reservoirs and hydrocarbon accumulation, great reservoir depth and high development costs. After investigating the regional geological situations in the northern depression of the Tarim basin, this paper systematically analyzes the characteristics of fault controlled carbonate oil and gas reservoirs and their reservoirs and clarified the control effect of strike-slip faults on oil and gas reservoirs. On this basis, the ideas on the well placement in this type of reservoirs were put forward. And the following research results were obtained. First, the strikeslip faults of Late Caledonian, Late Hercynian and Yanshan period are developed in the northern depression of the Tarim Basin, which form a three-layer structural style. Second, the carbonate reservoirs in the northern depression are mainly distributed in Ordovician Yijianfang Formation–Yingshan Formation. The reservoir space mainly includes pores, vugs and fractures which are formed by dissolution and tectonic rupture. The reservoirs are reworked strongly along the faults, and dissolved caverns and cavities are well developed. And thus, three types of fault controlled dissolved reservoirs are developed, i.e., cavern sealing type, cavern edge type and fracture-vug type. Third, discordogenic strike-slip faults have an obvious effect of "reservoir control, hydrocarbon accumulation control and enrichment control", and the NE trending fault is dominant in controlling hydrocarbon accumulation. Fourth, the high-efficiency well characteristics of "strike-slip fault + positive geomorphology + multi-phase bead reflection" in the main oil source are summarized, and the well location deployment method of "four determinations" is put forward, including zone determination, stage determination, well determination and trajectory determination. In conclusion, the new well location deployment idea improves the drilling success rate and the efficient well ratio, realizes the efficient development of fault controlled reservoirs in the Tarim Basin and is of referential significance to the development deployment of similar oil and gas reservoirs.
- Subjects
CHINA; GAS reservoirs; PETROLEUM prospecting; PETROLEUM reservoirs; CARBONATE reservoirs; OIL fields; HYDROCARBON reservoirs; NATURAL gas prospecting
- Publication
Natural Gas Industry, 2021, Vol 41, Issue 3, p21
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2021.03.003