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A method of tracing oil and gas activity

A technology for oil and gas activities, applied in the field of oil and gas exploration, can solve problems such as oil layer identification deviation, influence on oil and gas resource exploration and development progress, misinterpretation, etc., and achieve the effect of improving accuracy

Inactive Publication Date: 2020-11-17
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, it is difficult to accurately restore the accumulation process of oil and gas reservoirs in the complex structure research area by combining the analysis of geological conditions for oil and gas accumulation, organic geochemistry and oil and gas inclusion analysis, which seriously affects the exploration and development of oil and gas resources. schedule
[0003] In addition, at this stage, the identification of oil and water layers is generally based on data such as rock chip analysis, hydrocarbon testing in mud, oil pollution, and odor. At present, most of these methods are qualitative-semi-quantitative, and it is difficult to obtain definite identification indicators for oil and water layers. Often due to the impact of drilling mud invasion, it often causes wrong interpretations and brings deviations to oil layer identification

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  • A method of tracing oil and gas activity
  • A method of tracing oil and gas activity
  • A method of tracing oil and gas activity

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Experimental program
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Effect test

Embodiment 1

[0076] Oil and water layer identification

[0077] The central uplift belt of Dongying sag is a secondary structural unit in the middle of Dongying sag, which is obviously controlled by the structure. Since the sedimentation period of the third member of the Shahejie Formation, the rifting of the sag has been strengthened, and the expansion speed has been accelerated, and the faults are at the peak of development. The tectonic stress field changed significantly, the subsidence of the basin accelerated obviously, and the basin was in the stage of fault depression. During this period, a series of saline-freshwater lacustrine source rock deposits were formed, which was an important stage of oil generation in the basin. The third member of the Shahe Formation is located at a depth of 2500-3200m, in a lacustrine basin depositional environment, where turbidite sand bodies are widely distributed, and the source of paleofluids is mainly sedimentary water, which is less affected by exte...

Embodiment 2

[0108] Analysis of oil and gas accumulation process

[0109] The current Hezhuang structural belt is located in the west of the central fault uplift zone of the Dongying Sag, and is a secondary positive structural unit of the central anticline belt. The Sha2 Member is an important oil-bearing formation in the current Hezhuang structural belt. The depth ranges from 2100 to 2600 m, and the thickness of the formation is about 420 m. 1.4m. A large set of mudstone is developed in the upper part of the Sha2 Member, which can be used as a good cap rock; the lower part of the Sha3 Member develops high-quality source rocks, which provide abundant oil sources for the reservoirs; Structural units with positive structural background, such as the anticline and the fault nose of the main fault rising wall, are the main oil and gas accumulation units in this area. The fault oil and gas reservoirs formed by large and stable sand bodies in the uplift wall of the main fault are the main ones....

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Abstract

The invention provides a method for tracing oil and gas activities. The method comprises the following steps: acquiring a mass content of a kaolinite-contained clay mineral, a mass content of carbonate cement and abundance of a hydrocarbon-bearing fluid inclusion in a sample; and determining a type of a reservoir stratum at which the sample is located and an oil-gas accumulation process of the reservoir stratum according to the mass content of the kaolinite-contained clay mineral, the mass content of carbonate cement and abundance of the hydrocarbon-bearing fluid inclusion. Therefore, the oiland gas activities can be determined scientifically and reasonably; the oil and gas migration and accumulation histories can be restored; and thus the important base is provided for identifying and determining the oil-water layer and analyzing the oil-gas accumulation features accurately.

Description

technical field [0001] The invention relates to a method for tracing oil and gas activities, belonging to the technical field of oil and gas exploration. Background technique [0002] The continental faulted lake basins in eastern China and the superimposed basins in western China are important oil and gas exploration and development areas in my country at the present stage. The oil and gas reservoirs in this area generally experience multi-stage and multi-source oil and gas accumulation processes and complex later oil and gas reservoir adjustments. This process leads to the mixing of oil and gas from different sources and different maturities, which makes the commonly used organic geochemical indicators disordered. The recovery of oil and gas accumulation process by organic geochemical methods is often ambiguous; early oil and gas charging inhibits or even prevents the characterization of later oil and gas The formation of oil and gas inclusions during the charging process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/207
CPCG01N23/207
Inventor 曾溅辉孟伟曹喆贾凯育滕金良
Owner CHINA UNIV OF PETROLEUM (BEIJING)