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A method for identifying shale gas sweet spots using seismic layer velocity

A technology using seismic and layer velocity, applied in seismology for well logging, seismic signal processing, etc., can solve problems such as reducing reservoir volume density, low kerogen density, and slowing down seismic wave velocity

Active Publication Date: 2018-07-10
HUANENG CLEAN ENERGY RES INST
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Problems solved by technology

In addition, organic-rich shale is rich in kerogen, and the density of kerogen is low, ranging from 0.95-1.05g / cm 3 , also greatly reduces the volume density of the reservoir, resulting in the slowing down of the seismic wave propagation process

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  • A method for identifying shale gas sweet spots using seismic layer velocity
  • A method for identifying shale gas sweet spots using seismic layer velocity
  • A method for identifying shale gas sweet spots using seismic layer velocity

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Embodiment Construction

[0019] The preferred implementation of the present invention based on a shale gas sweet spot in a certain block will be described below with reference to the accompanying drawings.

[0020] refer to figure 2 , the method of the present invention comprises the following steps:

[0021] Step 1. Select the 3D seismic data body in the study area, use the seismic reflection characteristics of the shale interval, and combine the drilling synthetic record calibration to identify the shale interval;

[0022] According to the actual seismic data of a certain basin, the shale section is selected. The upper and lower interfaces of the shale formation usually have the characteristics of wave impedance difference (strong reflection). Due to the strong ability of the shale formation to reflect seismic waves, the peak reflection axis of the shale section is weak. Usually it appears dark or black on the seismic profile, and multiple sets of shale intervals can be identified. Combined with d...

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Abstract

A method for identifying shale gas sweet spots using seismic layer velocity. According to the strong reflection characteristics of the shale formation interface, which is significantly different from the overlying and underlying formations, the shale interval is selected on the seismic section in combination with exploratory wells; Gas-bearing will lead to the characteristics of low seismic wave propagation velocity, and the gas-bearing properties of shale can be identified through the abnormal seismic layer velocity; on the seismic section, through the analysis of the layer velocity of shale formations, the gas-bearing properties in shale intervals can be optimized better areas. On the plane, by analyzing the distribution characteristics of the shale layer velocity, the region with an abnormally low layer velocity is selected, that is, the region with a high gas content in the shale; by setting ant bodies and observing the seismic isochronous slice of the shale formation, it can be studied Fracture distribution density, and then fused with the layer velocity plane to identify shale gas sweet spots; using this method can effectively solve the problems of shale gas sweet spot prediction limitations and distribution prediction difficulties, and can more accurately identify shale gas sweet spots. The exploration and development of shale gas provides important geological information and basis.

Description

technical field [0001] The invention belongs to oil and gas exploration and development technology, in particular to a method for identifying shale gas sweet spots by using seismic layer velocity. Background technique [0002] In recent years, the exploration and development of shale gas in my country has developed vigorously, and shale gas in the Sichuan Basin has been commercially developed. Shale gas can effectively reduce environmental pollution and make up for the shortage of oil and gas energy. As an unconventional oil and gas resource, shale gas has the characteristics of tight reservoirs, low oil and gas abundance, and wide distribution area. It usually requires horizontal drilling and fracturing to increase production. my country's shale gas drilling, fracturing and other development technologies have made great progress through independent research and development on the basis of learning from foreign advanced technology practices, and the drilling and fracturing ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/50
Inventor 荆铁亚王金意张健赵文韬汪世清
Owner HUANENG CLEAN ENERGY RES INST
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