Palaeostress Judgement of Tectonic Fractures  in Chang 61 Low Permeable Reservoir in Yanhewan Area, Ordos Basin in Main Forming Period

Geoscience ›› 2009, Vol. 23 ›› Issue (5): 843-851.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Palaeostress Judgement of Tectonic Fractures in Chang 6₁ Low Permeable Reservoir in Yanhewan Area, Ordos Basin in Main Forming Period

ZHOU Xin-Gui¹, ZHANG Lin-Yan¹, HUANG Chen-Jun¹, LIU Ge-Yun², WAN Xiao-Long³, YAN Xi-Li¹

1Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing100081,China;
2College of Resource and Environmental Engineering, Lanzhou University, Lanzhou,Gansu730000,China；
3Academy of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi'an,Shaanxi710021,China

Received:2009-04-10 Revised:2009-07-20 Online:2009-10-20 Published:2012-02-16

Abstract

Abstract:

It must be definitely replied to the forming time of tectonic fracture in reservoirs and the state of palaeostress in estimating and predicting work. According to the method of acoustic emission(AE) palaeostress measurement, the effective percentage of the maximum principal stress can be concluded in the history of palaeo- structure.The AE measurements reveal that the corresponding maximum principal stress is in the range of 80 to 98 MPa in Chang 61 low permeable reservoir of Upper Triassic in Yanhewan area, Ordos Basin.Based on the result of palaeostress stage，the thermometry measurement of fracture filling inclusion and the evolution characteristics of regional stress field, it can be confirmed that the tectonic fractures form at Yanshanian movement.By the measurement of the strain of the conjugated fissures located in the outcrop area or the overlay area, the triaxial stress state in Yanshanian is resumed in this area.The direction of the maximum principal stress is NW-SE direction, predominant direction is 129°∠10°, the predominant direction of the minimum principal stress is 36°∠7°, the intermediate principal stress is approximate vertical.Those results can provide some references for prediction of tectonic fracture in low permeability reservoirs.

Key words: The period of tectonic fracture forming, the condition of palaeostress, Chang 6₁ low permeable reservoir, Yanhewan explorative area, Ordos Basin

CLC Number:

TE122.2

ZHOU Xin-Gui,ZHANG Lin-Yan, HUANG Chen-Jun, LIU Ge-Yun, WAN Xiao-Long,YAN Xi-Li. Palaeostress Judgement of Tectonic Fractures in Chang 6₁ Low Permeable Reservoir in Yanhewan Area, Ordos Basin in Main Forming Period[J]. Geoscience, 2009, 23(5): 843-851.

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Palaeostress Judgement of Tectonic Fractures in Chang 6₁ Low Permeable Reservoir in Yanhewan Area, Ordos Basin in Main Forming Period

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