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A Method for Evaluation of Lateral Sealing of Faults Using Single-layer Mudstone as Calculation Unit

An evaluation method and calculation unit technology, applied in the field of oil and gas exploration, to achieve the effect of predicting the lateral sealing of faults

Active Publication Date: 2022-02-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second shortcoming is that the SGR method only considers the mudstone smear on the study point by the fault hanging wall, but the fault footwall can also play a role in the mudstone smear on the research point

Method used

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  • A Method for Evaluation of Lateral Sealing of Faults Using Single-layer Mudstone as Calculation Unit
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  • A Method for Evaluation of Lateral Sealing of Faults Using Single-layer Mudstone as Calculation Unit

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Embodiment 1

[0065] 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 . Taking fault F5 in the study area as the research object, Well Kendong X1 and Well Kendong X2 are respectively located in the hanging wall and footwall of fault F5 ( Figure 5 ), Well Kendong X1 is an oil-producing well and Kendong X2 is a non-oil-producing well; the completely different exploration results of the two wells indicate that the lateral sealing of faults is the key factor controlling the distribution of oil and gas in this area. Mudstone smear is the key factor for forming the lateral sealing of faults in this area, and the principle of mudstone smearing on faults by a single layer of mudstone shows that ( figure...

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Abstract

The present invention proposes a fault lateral sealing evaluation method using single-layer mudstone as the calculation unit, which belongs to the technical field of oil and gas exploration, and can fully consider the mudstone smearing of the research point on the fault hanging wall and the fault footwall and the single-layer mudstone and the research point. The high-grade fault gouge ratio (SSGR) is used to quantitatively characterize the lateral sealing of faults. The evaluation method includes the following steps: collecting lithology data of the hanging wall and footwall of the fault in the study area, oil and gas layer depth data D and fault distance data T. Take the point at depth D in the fault as the research point, and calculate the smear effect SSGR on the hanging wall of the fault from depth D to D+T h . Calculating the effect of smearing on the footwall of faults at depths D to D‑L SSGR f . SSGR h with SSGR f Multiply each by the equivalent coefficients N and M and add up to get the SSGR value. The minimum value of all SSGR values ​​at the depth D of the research point in the fault is regarded as the threshold Q. If the SSGR value of the non-depth D research point is greater than or equal to the threshold Q, the research point has the fault lateral sealing; otherwise, the research point does not have the fault lateral sealing.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, in particular to a fault lateral sealing evaluation method using single-layer mudstone as a calculation unit. 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. For normal faults, the stratum is divided into two plates after being staggered by the fault, the relatively descending plate is called the hanging wall of the fault, and the relatively rising plate is called the footwall of the fault. Fault-block oil and gas reservoirs are widely developed in continental faulted basins, and faults have become key areas for oil and gas enrichment. The key to exploration of fault-block oil and gas reservoirs is to determine whether faults have lateral sealing, because the lateral sealing of faults directly determines the Whether oil and gas c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00G01N33/24
CPCG01V9/00G01N33/24
Inventor 王宇蒋有录赵凯苏圣民
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)