Fault lateral sealing performance evaluation method taking single-layer mudstone as calculation unit
An evaluation method and computing unit technology, applied in the field of oil and gas exploration, to achieve effective prediction
Active Publication Date: 2021-06-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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
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Embodiment 1
[0065] Take the northeastern region of the northeast, the north of the northeast is depressed in the north, and the west is embedded in the west and the long embankment - Lonely convex, the south neighboring Qingdong depression and the green scorpion convex Low projection and Laizhou Bay depression, the exploration area is about 396km 2 . Taking the research area fracture F5 as the study object, the Zhandong X1 well, the Zhandong X2 well is located in the fault F5 of the fault F5 and the lower plate ( Figure 5 ), Kelong X1 wells for oil wells, and the Zhandong X2 well is a non-oil well; the four well-different exploration results say that the laminar side sealing is a key factor in controlling the oil and gas distribution of the region. Mudstone is a key factor in forming a fault laterally closed in the region, and a single layer of mudstone demented with the laminated mudstone indicates ( figure 2 ), Single-layer mudstone is divided into single-layer mudstone on the off plate and...
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The invention provides a fault lateral sealing performance evaluation method taking a single-layer mudstone as a calculation unit, and belongs to the technical field of oil-gas exploration. The method can fully consider mudstone smearing of a fault hanging wall and a fault footwall on a research point and the distance between the single-layer mudstone and the research point, and quantitatively characterize the fault lateral sealing performance by using a high-grade fault mud ratio (SSGR). The evaluation method comprises the following steps: collecting lithology data of the hanging wall and the footwall of a fault in a research area, hydrocarbon reservoir depth data D and fault displacement data T; with the point with the depth being D in the fault as a research point, calculating the smearing effect SSGRh from the depth D to the hanging wall of the fault with the depth being D+T; calculating the smearing effect SSGRf of the footwall of the fault from the depth D to the depth D-L; multiplying the SSGRh and the SSGRf by equivalent coefficients N and M respectively, and adding to obtain an SSGR value; regarding the minimum value of all the SSGR values of the research point with the depth of D in the fault as a threshold value Q; if the SSGR value of the non-depth D research point is greater than or equal to the threshold value Q, determining that the research point has fault lateral closure; and if not, judging that the research point does not have fault lateral sealing performance.
Description
Technical field [0001] The present invention belongs to the field of oil and gas exploration, and in particular, the present invention relates to a method of evaluating the fault laterally closedness of the calculation unit in a single layer of mudstone. Background technique [0002] The fault is a structure formed by a significant relative displacement of the cross-sided rock in the rupture surface due to the fracture of the crustal force. For the front layer, the formation is divided into two plates after the fault is displaced, and the relative drop of the relative drop is called a fault, and the relative rise of the disc is called the off plate. In the container, there is a wide range of oil and gas reservoirs, and the fault has become the key area of oil and gas enrichment, and the key to the exploration of the broken metal is to clear whether the fault has lateral closure because the fault lateral sealing is directly determined. Can the oil gases aggregate at the fault: W...
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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)