Intercommunicating unit division method and mining method for biological reef gas reservoir

Abstract

The invention discloses an intercommunicating unit division method and mining method for a biological reef gas reservoir. The division method comprises the steps of carrying out gas layer system division of the biological reef gas reservoir, carrying out reef intercommunication analysis of each reef unit in each gas-bearing layer system, dividing the adjacent reef units meeting a consistency result into reef intercommunicating units, performing fluid property and distribution characteristic analysis and stratum pressure system characteristic analysis on each reef unit reservoir, and dividing each reef unit reservoir meeting the consistency result into a same reservoir intercommunicating unit. According to the method for dividing the intercommunicating units of the biological reef gas reservoir, the same reservoir intercommunicating units can be divided objectively, scientifically and reasonably, a basis can be provided for scientific and reasonable balanced development technical policies of the biological reef gas reservoir, a development technical policy can be specified for each reservoir unit, and therefore, the water-free gas production period of the whole biological reef is prolonged, and the stable production period and the production degree are improved.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a method for dividing connected units for reef gas reservoirs and a mining method for reef gas reservoirs. Background technique [0002] Due to the characteristics of the development of internal pores and vugs, organic reefs play an important role in carbonate oil and gas fields with good storage performance, forming complex lithologic oil and gas reservoirs. Some oil and gas fields in the western part of my country belong to the gentle slope platform margin reef deposits. This type of reef generally has the characteristics of small reef body, multi-stage vertical superposition, and scattered distribution in the plane, resulting in poor connectivity and heterogeneity of the reservoir. Strong, natural gas composition, gas-water relationship and pressure system are complex. [0003] At present, the mining method for this type of reef ga...

AI Technical Summary

Problems solved by technology

Some oil and gas fields in the western part of my country belong to the gentle slope type platform margin reef deposits. This type of reef generally has the characteristics of small reef body, multi-stage vertical superposition, and scattered distribution in the plane, resulting in poor connectivity and heterogeneity of the reservoir. Strong, natural gas composition, gas-water relationship and pressure system are complex

[0003] At present, the mining method for this type of reef gas reservoir is still through overall mining and overall evaluation. The mining methods for each gas well in this reef gas reservoir are almost the same, so it is impossible to achieve different locations of the reef gas reservoir. The distribution of natural gas is developed in a scientific and reasonable balanced way, and it is impossible to reasonably adjust the production policy of each gas well according to the actual situation during the production process. This method of overall production and overall evaluation directly leads to the comparison of the overall stable production period of this type of reef gas reservoir. Generally, it is only 5-6 years. After 5-6 years, the gas production of this type of reef gas reservoir will drop significantly; at the same time, due to the relatively short effective production time, it will directly lead to the overall recovery of this type of reef gas reservoir. The output level is also relatively low, generally lower than 45% of the actual gas storage capacity

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