Method for determining tufaceous content of high-gamma sandstone

A technology of gamma sandstone and tuff, applied in measuring devices, nuclear radiation exploration, geophysical measurement, etc., can solve the problems of simple volume model and not fully considering the differences of pore fluid types, etc., and achieve accurate interpretation results , The effect of accurate logging response value

Active Publication Date: 2016-03-23
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

The volume model established by the commonly used volume model method is simple, and does not fully consider the differences in skeleton

Method used

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  • Method for determining tufaceous content of high-gamma sandstone
  • Method for determining tufaceous content of high-gamma sandstone
  • Method for determining tufaceous content of high-gamma sandstone

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Embodiment 1

[0060] High-gamma sandstone strata were developed in the Lower Cretaceous Nantun Formation in an oil-bearing block in the Tanan Sag. The high-gamma sandstone in the study area is caused by high tuffaceous content, and the spatial distribution difference of this tuffaceous content can reflect the depositional environment Therefore, the quantitative calculation of tuffaceous content is of great significance for restoring the paleo-sedimentary environment. There are 216 core sample points in the target section of the study area. The thickness of the target layer in this study is 120m, and the logging data has 960 depth data points (logging sampling is one sample point every 0.125m, and there are 8 logging information per meter. depth data points). Previous studies on the tuffaceous content of high gamma sandstone in the research area were mainly through thin-section analysis of core samples, and there was no effective method for the non-coring section. According to the method of ...

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Abstract

The invention belongs to the field of oil and gas, and particularly relates to a method for determining the tufaceous content of high-gamma sandstone. A volume model of a rock and volume models of the components of the rock are established, and a tufaceous content determining method based on nested volume models is formed. The method comprises the following steps: standardizing well logging data; establishing a rock volume model, and determining the composition and content of the framework, tuffaceous and mud in the rock; adopting a photoelectric absorption cross section index-natural gamma ray method to identify a high-gamma sandstone reservoir interval based on a well logging curve; selecting a well logging curve for determining the tufaceous content; using a nested volume model to determine the well logging parameter of the rock framework; using a nested volume model to determine the well logging response parameter of tuffaceous; using a nested volume model to determine the well logging response parameter of mud; determining the well logging response parameter of pores according to the type of fluid; and establishing a rock volume model equation, and determining the tuffaceous content. According to the invention, a nested two-layer volume model is adopted, and the explaining result is more accurate.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas, and particularly relates to a method for determining the tuffaceous content of high gamma sandstone, which uses rock analysis test data and geophysical logging data to determine the tuffaceous content in high gamma sandstone. Background technique [0002] "High gamma sandstone reservoir" refers to a sandstone reservoir with a natural gamma value similar to mudstone in clastic oil and gas reservoirs, which belongs to a new type of unconventional oil and gas reservoirs because of its "high Natural gamma ray characteristics are often mistaken for non-reservoirs and neglected in oil and gas exploration and development, but recent oil and gas exploration practices have shown that this type of reservoir has considerable oil and gas productivity, and is an important tool in the exploration and development of clastic rock reservoirs. a new field of . [0003] Studies on high gamma ray sandstone ...

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Application Information

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IPC IPC(8): G01V5/12
CPCG01V5/12
Inventor 张涛张宪国林承焰于景峰张守秀王彦华冯建国韩承豪臧家君
Owner SHANDONG UNIV OF SCI & TECH
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