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Fault activity quantitative evaluation method

A quantitative evaluation and activity technology, applied in the field of oil and gas exploration, can solve the problem of less research on the frequency of fault activity, and achieve the effect of ensuring accuracy

Inactive Publication Date: 2020-04-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] However, there are few studies on the frequency of fault activity

Method used

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Embodiment 1

[0041] Taking the Northeast Kent area as the research area, the Northeast Kent area is bordered by the Yellow River Mouth Sag in the north, Fulin Sag in Zhanhua Sag and Changdi-Gudong Uplift in the west, Qingdong Sag and Qingtuozi Uplift in the south, and Laibei in the east. Low uplift and Laizhou Bay depression, the exploration area is about 396km 2 . The main accumulation period in the study area was the depositional period of the Minghuazhen Formation. Many oil and gas reservoirs have been discovered in the lower part of the Guanbei Formation and the upper part of the Dongying Formation in the Northeast Ken area (such as Well Kendong 48 and Well Kendong 473), while the oil and gas reservoirs in the Lower Dongying and Shahejie Formation There are few reservoirs (such as Well Kendong 89 and Well Kendong 891), and fault activity is an important factor restricting the vertical distribution of oil and gas in this area. The method for quantitative evaluation of fault activity in...

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Abstract

The invention provides a fault activity quantitative evaluation method, belongs to the technical field of oil and gas exploration, and can quantitatively characterize fault activity from the perspective of fault activity multiplicity. The evaluation method comprises the following steps: 1, seismic inversion is carried out on a research area; an intra- fault interpretation point, a descending discinterpretation point and an ascending disc interpretation point are selected, and a wave crest frequency attribute corresponding to each interpretation point is calculated; a wave crest frequency attribute plane graph is drawn; a descending disc research point and an ascending disc research point are selected; anomaly judgment is respectively performed on the descending disc research point and theascending disc research point along the distribution direction of a sand body; if an abnormal point exists in the descending disc research point or / and the ascending disc research point; a new research point is replaced, anomaly judgment is conducted on a new research point until no anomaly point exists in the research point, the activity frequency of the corresponding part of a fault is described according to the wave peak frequency attribute difference value of the current descending disc research point and the current ascending disc research point, and a fault activity evaluation result isobtained.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, in particular to a quantitative evaluation method for fault activity. Background technique [0002] A fault is a structure formed by a significant relative displacement of the rock blocks on both sides along the fracture surface due to the fracture of the earth's crust. In continental faulted basins, faults are the key channels connecting source rocks and reservoirs. For fault-block oil and gas fields, the vertical shielding of faults in the critical period of accumulation is one of the factors to analyze whether oil and gas can accumulate and form: When faults are active, inter-fault fractures and micro-fractures provide a "high-speed channel" for oil and gas migration, and oil and gas tend to accumulate at the highest point of fault active parts; when faults stop active, oil and gas are often in the dominant sand bodies in the formation Migrate in the middle, and eventually acc...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 蒋有录王宇刘景东李明阳沈澈
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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