渤海油田渤中A构造太古宙潜山裂缝储层预测

doi:10.11720/wtyht.2021.2569

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Abstract

Drilling has revealed that the Archean buried hill of BZ-A has great potential for natural gas exploration.In the target area,the metamorphic rock fracture reservoir in Archean buried hill has many problems such as great buried depth,strong heterogeneity of the reservoir and rapid lateral changes,which pose challenges to the exploration.Based on the study of the genetic mechanism of fractured reservoirs in buried hill,the authors comprehensively analyzed the features of the weathered fractured zone and the inner fractured zone,and established a targeted technical system for the description of fractured reservoirs in buried hill.For the weathered zone fractured reservoir,the pre-stack fracture reservoir porosity prediction technology based on the double-parameter was innovatively used,and the fracture reservoir porosity was predicted by the 3D elastic parameter analysis,and the distribution of the fractured reservoir in the weathered zone was finely described.For the inner fractured zone,the F-K domain coherence enhancement technique was used to improve the imaging of the buried hill.The method of edge enhanced crack detection based on clustering analysis was used to comprehensively characterize the distribution of reservoir in the inner fracture zone.Through the comprehensive application of targeted geophysical techniques, the exploration evaluation of BZ-A has been strongly promoted,thus providing a strong basis for the further exploration evaluation of the target area.

Key words： fracture reservoir Archean buried hill porosity prediction F-K coherence enhancement edge detection

Received: 05 December 2019 Published: 01 March 2021

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	Yao LI
	Xiao-Jie ZHANG
	Gong-Li LIU
	Min GONG

Cite this article:

Yao LI,Xiao-Jie ZHANG,Gong-Li LIU, et al. The prediction of Archean buried hill fracture reservoir in BZ-A structure of the Bohai oilfield[J]. Geophysical and Geochemical Exploration, 2021, 45(1): 37-45.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.2569 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I1/37

Zoning map of buried hill in well 1

Fracture reservoir zoning pattern in buried hill

Well 1 and well 2 crossplot of elastic parameters

Fracture porosity fitting based on dual structure
a—3D elastic parameter analysis;b—prediction of fracture porosity curve

Porosity profile of pre-stack prediction

Plane attribute of the porosity

Paleogeomorphic map of buried hill top

Noiseless model of steep reflection

Noise model of steep reflection

Noiseless model in F-K domain

Noise model in F-K domain

F-K domain coherent enhanced model

Seismic profile of original pure wave

Seismic profile after F-K domain coherent enhancement

Flow of clustering analysis edge enhancement fracture detection

Result of bidirectional clustering edge enhancement fracture detection
a—profile of clustering edge enhancement fracture detection after F-K domain coherent enhancement;b—seismic profile after F-K domain coherent enhancement

Comprehensive prediction effect of fractured reservoir in Archean buried hill
a—the distribution of the fractured reservoir in the weathered zone;b—the distribution of reservoir in the inner fracture zone;c—the drill bore column

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