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Offshore deep natural gas reservoir sweet spot evaluation method

An evaluation method and natural gas technology, applied in the field of oil and gas reservoir geology, can solve problems such as difficulty in evaluating reservoir quality, achieve good evaluation effect and solve practical problems.

Active Publication Date: 2021-06-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Research in the industry shows that low-permeability-tight sandstone reservoirs are the main formations for the beneficial development of natural gas. This type of reservoirs is mainly affected by sedimentation, diagenesis and tectonics; and has experienced multiple diagenetic events. There are many uncertainties, which make it difficult to evaluate the reservoir quality

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  • Offshore deep natural gas reservoir sweet spot evaluation method
  • Offshore deep natural gas reservoir sweet spot evaluation method
  • Offshore deep natural gas reservoir sweet spot evaluation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23 and Figure 24 As shown, a sweet spot evaluation method for deep offshore natural gas reservoirs provides diagenetic evolution sequence, diagenetic facies division scheme, porosity-depth curve of diagenetic facies, distribution of seismic diagenetic facies, reservoir "sweet spots" classification criteria, diagenetic numerical simulation , reservoir "sweet spot" evolution process and spatial distribution, etc., including the following steps:

[0051] Step 1), collecting data: collecting geological data, well logging data, seismic data and analysis and testing data; well logging data includes well logging interpretation porosity and logging interpretatio...

Embodiment 2

[0105] Embodiment 2: as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23 and Figure 24 As shown, an offshore deep natural gas reservoir sweet spot evaluation method includes the following steps:

[0106] Step 1), collecting data: collecting geological data, well logging data, seismic data and analysis and testing data; well logging data includes well logging interpretation porosity and logging interpretation permeability curve; analysis and testing data includes casting thin slices, cathode luminescence thin slices , scanning electron microscope, powder particle size analysis data, conventional core analysis data, quantitative statistical data of casting thin-section petrography and clay X-ray diffraction analysis data.

...

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Abstract

An offshore deep natural gas reservoir sweet spot evaluation method belongs to the field of oil and gas reservoir geology. The method comprises the steps of: collecting and sorting geological, logging, earthquake and analysis test data; establishing a diagenesis evolution sequence and a diagenesis phase division scheme; obtaining diagenesis numerical simulation parameters based on powder particle size analysis, conventional core analysis, lithofacies quantitative statistical data and clay x-ray diffraction analysis data; explaining seismic lithogenous phase distribution of sandstone at a target layer based on typical stratigraphic slices; establishing a reservoir sweet spot classification standard according to the porosity, the permeability and the lithogenous phase; and implanting the parameters into a diagenetic numerical model. On the basis of the burial history and the thermal history, the diagenetic model and the seismic diagenetic phase are combined for diagenetic numerical simulation research, and the porosity evolution process and spatial distribution of the sandstone at the target layer are reproduced. A reservoir sweet spot evolution process and spatial distribution of the sandstone at the target layer are reproduced according to the reservoir sweet spot classification standard.

Description

technical field [0001] The invention belongs to the field of geology of oil and gas reservoirs, in particular to a method for evaluating sweet spots of offshore deep natural gas reservoirs. Background technique [0002] Tight sandstone gas resources have great potential and play an important role in unconventional oil and gas resources. Tight sandstone gas is one of the important areas of global unconventional natural gas exploration and development. Industry research shows that a number of large tight gas fields have been discovered in the Upper Paleozoic of the Ordos Basin in China, the Triassic Xujiahe Formation in the Sichuan Basin, and the Kuqa Depression in the Tarim Basin. A number of tight gas wells with high production have been discovered in Basin and other areas, showing good development prospects. It is generally recognized in the industry that reservoir quality is closely related to production capacity, and the core problem restricting the effectiveness of tig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/50
CPCG01V1/50G01V2210/1293G01V2210/6244
Inventor 林承焰王文广黄导武张宪国段冬平黄鑫董春梅任丽华刘彬彬林建力
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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