A method for identification of oil and gas escape area caused by structural damage

Abstract

The present invention proposes a method of judging the oil and gas loose area caused by the destruction, which is the field of oil and gas exploration technology. It determines the vertical preservation conditions of the oil and gas through the judgment of the disconnection of the broken cover in the Tibetan period, and then identifies the oil and gas Yi YiSan area.The method of judgment method of the oil and gas loose area caused by the destruction of the structure includes the following steps: within the target layer of the research area, select multiple measuring points that are evenly covered in the scope of the research area;Earthquake data, calculate the lower cement ratio of each measuring point at the lower limit of SGR lim ; According to the recording, drilling and earthquake data of the research area, calculate the proportion of mud rock ratio SGR corresponding to each Tibetan fracture layer corresponding to each measurement point 古 ; According to the data data of the research area, calculate the current fault ratio SGR corresponding to the today's testing point 现今 ; 古 <sgr lim SGR 现今 <sgr lim At that time, there is a scattered oil and gas dispersing at the measuring point.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, in particular to a method for identifying oil and gas escape areas caused by structural damage. Background technique [0002] The actual exploration results show that, according to the fluid inclusion method, GOI test and other methods, it is determined that there is oil and gas accumulation at a certain well location, but the drilling effect is often poor and the production is low. It has been found through research that, for oil and gas reservoirs formed in two or more stages, after the accumulation, if the fault-cap configuration conditions in each accumulation stage are poor, the oil and gas reservoirs will be damaged due to structural uplift or fault opening. Oil and gas can easily migrate upward along the fault and escape, resulting in very little residual oil and gas, low production and poor drilling effect. [0003] However, for the study of oil and gas accumulation perio...

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Problems solved by technology

[0002] The actual exploration results show that, according to the fluid inclusion method, GOI test and other methods, it is determined that there is oil and gas accumulation at a certain well location, but the phenomenon of poor drilling effect and low production often occurs

It has been found through research that, for oil and gas reservoirs formed in two or more stages, if the fault-cap configuration conditions in each accumulation stage are poor after the accumulation, the oil and gas reservoirs will be damaged due to structural uplift or fault opening. Oil and gas easily migrate upward along the fault and escape, leaving little oil and gas in the end, resulting in low production and poor drilling effect

[0003] However, for the study of oil and gas accumulation period, the current main methods include hydrocarbon generation and expulsion period method, fluid inclusion method and trap time method, etc. These methods can only determine the accumulation period, but cannot determine whether the oil and gas reservoir has been destroyed. It may mislead the oil and gas exploration prediction results and affect the oil and gas exploration process

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