Abstract

Carbonate reservoirs are the main reservoir types in China, which occupy the large ratio of reserves and production at present. The high-efficiency development of carbonate reservoirs is of great significance to assure the stability of national energy supply. The Lower Paleozoic reservoir in Jingbian gas field and the Sinian reservoir in Anyue gas field are two typical carbonate gas reservoirs, and their successful development experiences can provide significant references for other similar carbonate gas reservoirs. For Jingbian gas field, it is a lithological-stratigraphic reservoir developed in a westward monocline and multiple rows of nose-fold structures, and is a stable craton basin with simple palaeognomy distribution and stable connectivity, which has complex gas-water distribution. However, for Anyue gas field, it is a lithological-structural reservoir with multiple tectonic high points and multiple fault systems, and is biological dune beach facies under extensional setting with highly differentiated inside of the block in palaeognomy characteristics, which has limited connectivity and tectonic side water is in a local area. The difference of gas reservoir characteristics leads to the diverse development strategies. For these two gas reservoirs, although there are some similar aspects, such as the screen of enrichment areas, the application of irregular well pattern and reservoir stimulation techniques, the criteria of enrichment areas, the well types, and the means of reservoir stimulation are absolutely different. In addition, due to the differences of control reserves and production capacity for these two kinds of reservoirs, the mode of stable production is also different. The effective development of Jingbian gas field can give some references to the future exploitation on the Sinian gas reservoir. Firstly, the sedimentary characteristics should be studied comprehensively. Secondly, the distribution pattern and distribution characteristics of the palaeognomy should be found and determined. Thirdly, the distribution of fracture system in the reservoir should be depicted finely. Finally, dynamic monitoring on the production performance should be strengthened, and the management for this gas field should be improved further. The findings of this study can help for better understanding of the Karst weathering-crust carbonate gas reservoir formation characteristics and the optimal development technologies that should be taken in practice.

Highlights

  • Carbonate rock is an important type of oil and gas reservoirs. 45% of global natural gas recoverable reserves and 60% of production are attributed to carbonate rock reservoirs

  • The following conclusions and understandings are obtained: (1) Significant differences exist in gas reservoir characteristics between the Sinian gas reservoir in the Anyue gas field and the Lower Paleozoic gas reservoirs in the Jingbian gas field

  • (1) Gas reservoir types: the Sinian gas reservoir in the Anyue gas field represents a lithologic-structural trap with multiple structural high points and multiple fracture systems, which is different from the lithologic-stratigraphic trap associated with the Jingbian Lower Paleozoic gas reservoir featuring a west-trending monocline and multirowed nose-fold structures

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Summary

Introduction

Carbonate rock is an important type of oil and gas reservoirs. 45% of global natural gas recoverable reserves and 60% of production are attributed to carbonate rock reservoirs. Because the two types of gas reservoirs both belong to the karst weathering-crust carbonate rock gas reservoir, it is of great guiding significance to compare and analyze the similarities and differences between the gas reservoir characteristics and development technology strategies and learn from the successful development experience of the Jingbian gas field, for expanding the exploration area of the Sinian gas reservoir in the Sichuan Basin, and development appraisal and rapid production establishment of the Gaomo area. In this paper, in terms of two typical carbonate gas reservoirs in China, we do study the formation characteristics for these two reservoirs, such as structure, sedimentation, and pore types, but we review the development strategies and technologies in field practice, which can be seen as the primary novelty compared with previous researches.

Overview of Two Gas Reservoirs
General review of development history
Comparative Analysis on the Development History
Comparative Analysis on Gas Reservoir Characteristics
Comparative Analysis of Development Strategies and Technologies
Inspirations for the Development of Sinian
Findings
Summary and Conclusions
Full Text
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