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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 66 (1982)

Issue: 5. (May)

First Page: 591

Last Page: 591

Title: Structural Analysis of Western Sirte Basin, Libya (S.P.L.A.J.): ABSTRACT

Author(s): Sugaier M. Kumati, Joseph M. Anketell

Article Type: Meeting abstract

Abstract:

Examination of surface sediments and tectonic features in the oil-rich Hofra area, western Sirte basin, Libya (S.P.L.A.J.), demonstrates that this area was subject to periodic movement of blocks due to faulting and probably also eperiogenic uplift.

It is here proposed that the faults are the major structures in that it is possible to interpret some, if not all, of the folds as having formed in relation to reactivation of the fault systems. The fault systems may be interpreted in terms of a major "bull-nose" Riedel P Shear structure related to a deep-seated fault along which there was left-handed movement. The faults making up the major bull-nose structure and in particular the Abu Shush fault system display Riedel Shears in patterns indicative of left-handed movement. Abu Shush fault system appears to display a northerly change from styles ranging from those typical of a pre-residual to a peak structural situation. In addition, the post-peak to pre-residual styles typical of the southern part of the Abu Shush fault zone are asso iated with reversal of stress patterns along a major P zone in the southern part of the Gedari fault zone.

The complexities in stratigraphic relationships resulting from such events may often not be easily recognized in boreholes without exhaustive paleontologic studies, particularly when one considers that most of the unconformities display little variation in dip across the unconformable surface.

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