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AAPG Bulletin

Abstract

AAPG Bulletin, V. 99, No. 11 (November 2015), PP. 19912003

Copyright copy2015. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/06011513195

Unreliable determination of in situ stress orientation by Previous HitboreholeNext Hit breakouts in fractured tight reservoirs: A case study of the upper Eocene Hetaoyuan Formation in the Anpeng field, Nanxiang Basin, China

Lianbo Zeng,1 Xiaomei Tang,2 Jianwei Jiang,3 Yongmin Peng,4 Yongli Yang,5 and Wenya Lyu6

1State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China; [email protected]
2College of Geosciences, China University of Petroleum, Beijing 102249, China; [email protected]
3Henan Oilfield Branch, Sinopec, Nanyang 473132, China; [email protected]
4Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China; [email protected]
5Henan Oilfield Branch, Sinopec, Nanyang 473132, China; [email protected]
6College of Geosciences, China University of Petroleum, Beijing 102249, China; [email protected]

ABSTRACT

Elliptic Previous HitboreholeNext Hit breakouts are usually used to determine the orientation of in situ stress in deep sedimentary basins. The long axes of Previous HitboreholeNext Hit breakouts are generally perpendicular to the maximum horizontal principal compression stress (SHmax). However, the azimuth of Previous HitboreholeNext Hit breakouts is found perpendicular to the chief strike (but not to SHmax) of natural fractures in tight reservoirs, Anpeng field of Nanxiang Basin, China. Based on the core data and acoustic and resistivity Previous HitboreholeNext Hit image logs, the natural fractures are intensively striking at east-west orientation where Previous HitboreholeNext Hit breakouts occurred in north-south. If the Previous HitboreholeNext Hit breakouts are induced only by in situ stresses surrounding the well and the Previous HitboreholeNext Hit breakouts are known at north-south, SHmax should be perpendicular at east-west, but according to analyses of the earthquake focal mechanism in circumjacent regions, hydraulic fracturing data, drilling-induced fracture data, and the production performance data, SHmax is in the northeast-southwest direction. This contradiction indicates that the influence of natural fractures may cause a serious deviation of the azimuth of Previous HitboreholeNext Hit breakouts. Therefore, in this case, it is unreliable to determine the orientation of in situ stress only by Previous HitboreholeTop breakouts in fractured tight reservoirs. In addition, the main fluid flow direction is not parallel to the dominant natural fracture, which is controlled by in situ stress in tight reservoirs.

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