Paleozoic fault systems of the Tazhong Uplift, Tarim Basin, ChinaMarine and Petroleum Geology

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Authors
Chuanxin Li, Xiaofeng Wang, Benliang Li, Dengfa He
Year
2013
DOI
10.1016/j.marpetgeo.2012.09.010
Subject
Economic Geology / Geology / Geophysics / Oceanography / Stratigraphy

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Received 14 December 2011

Available online 30 October 2012

Keywords:

Fault systems ret marine Ordovician carbonate reservoirs in Tazhong Uplift have been recognized as the prime exploration target in the area.

Petroleum geologists have paid more attention to Paleozoic importance is the acquisition and processing of continuous highresolution 3-D seismic coverage data, collected by the Tarim Oil

Company, CNPC. These seismic data covering an area of 4500 km2 provide detailed subsurface information and make it feasible to carry out a regional structural analysis (Li et al., 2009, 2010).

In this paper, characteristics, distribution and dynamic mechanisms of Paleozoic faulting are discussed on the basis of comprehensive interpretations of the new 3-D data. This study used an integrated database that included eight 2D seismic profiles across * Corresponding author. Research Institute of Petroleum Exploration & Development e Langfang, CNPC, Guangyang Street, Langfang 065007, Hebei Province,

China. Tel.: þ86 10 69213094; fax: þ86 10 69213417.

Contents lists available at

Marine and Petro journal homepage: www.else

Marine and Petroleum Geology 39 (2013) 48e58E-mail address: chuanxin_li@163.com (C. Li).Fault systems and their distribution play important roles in basin architecture, geomorphology and geography. At the same time, they often have a key influence on hydrocarbon migration and accumulation in a petroliferous basin. The Tazhong Uplift is located in the central Tarim Basin (Jia et al., 1995; Jia, 1997), and is one of the most important exploration areas. Few researchers focused on Paleozoic fault systems of the Tarim because they are covered by several kilometers of undisturbed Meso-Cenozoic sedimentary sequences that underlie the Taklimakan Desert (Lu and Hu, 1997; Zhang and Jia, 1997).

With the development of deep hydrocarbon exploration, the 2010a, 2010b, 2012; Zhao et al., 2006; Sun et al., 2007; Li et al., 2008; Zhou et al., 2011; Lin et al., 2012). They provide important oil and gas migration channels, but also have a major influence on reservoir development, particularly on karst reservoirs in the

Yingshan Formation, early Ordovician and the reef-shoal reservoirs of the Lianglitage Formation, late Ordovician. However, due to the limitations of early low-resolution seismic data, few integrated studies focused on the fault distributions, structural styles, tectonic stages and dynamic mechanisms in the central Tarim Basin.

New borehole, log and seismic data have been obtained during recent exploration and development of Tazhong Uplift. Of greatStrike-slip fault

Magmatic plugs

Tazhong Uplift

Tarim Basin 1. Introduction0264-8172/$ e see front matter  2012 Elsevier Ltd. http://dx.doi.org/10.1016/j.marpetgeo.2012.09.010by thick and undisturbed Meso-Cenozoic sedimentary sequences. Four Paleozoic fault systems have been recognized: (1) the CambrianeEarly Ordovician extensional faulting, (2) the Late Ordovician NWW trending thrust faulting, (3) the SilurianeDevonian NNE strike-slip faulting and (4) the Permian plutonism influenced by pre-existing fault planes. Zones of weakness created during CambrianeEarly

Ordovician extensional faulting influenced subsequent tectonic movements. The Late Ordovician fault system divides the Tazhong Uplift into several deformation zones. Their mechanical characteristics vary across the study area, with stronger thrusting in the east. The SilurianeDevonian strike-slip fault system consists of three components: main faults, subordinate en echelon faults, and fault troughs. The main faults appear as steeply dipping, almost vertical, offsets on seismic map view, with associated flower structures on seismic profiles, together with other levels of faults. The Permian magmatic plugs have a spotty or bandy distribution, and are interpreted to have utilized former faults.  2012 Elsevier Ltd. All rights reserved. structure and begun to realize the complexity of Paleozoic fault systems (Zhang et al., 2002; Li et al., 2004, 2006; Wu et al., 2005,20 September 2012

Accepted 29 September 2012time of oceanic closure. Paleozoic faults of the Tazhong Uplift in the hinterland of Tarim Basin are cappedReceived in revised form high-resolution reflection seismic data in a portion of Tarim Basin. The tectonic history began with oceanic spreading during the CambrianeEarly Ordovician and continues beyond the SilurianeDevonianPaleozoic fault systems of the Tazhong

Chuanxin Li a,b,*, Xiaofeng Wang c, Benliang Li d, De a School of Energy Resources, China University of Geosciences, Beijing 100083, China bResearch Institute of Petroleum Exploration and Development e Langfang, CNPC, Gua c Tarim Oil Company, CNPC, Korla 841000, China dResearch Institute of Petroleum Exploration, CNPC, Beijing 100083, China a r t i c l e i n f o

Article history: a b s t r a c t

This report presents interpAll rights reserved.lift, Tarim Basin, China fa He a ng Street, Langfang 065007, Hebei Province, China ations developed from a detailed study of new three-dimensional (3-D)

SciVerse ScienceDirect leum Geology vier .com/locate/marpetgeo the Tazhong uplift and more than 100 well logs, which provide a firm basis for the recognition and mapping of the major fault system that can be recognized on seismic profiles. 2. Geological setting and stratigraphy

The Tarim Basin, with an area of about 560,000 km2, is the largest petroliferous basin of China. It is surrounded by the Tianshan Mountains to the north, the western Kunlun Mountains to the south, and the Altyn Mountains to the southeast (Fig. 1). Based on the interpretation of a grid of two-dimensional (2D) seismic data,

Tarim basin is divided into seven major structural units including three uplifts and four depressions (Jia, 1997), that is the Kuqa depression, the Tabei uplift belt, the North depression belt (the

Manjiaer and the Awati depressions), the Central uplift belt, the

Southwestern depression belt, the Tadong uplift belt and the

Southeast depression (Fig. 1). The Tazhong uplift, trending NWeSE, is located at the Center uplift belt with an east-west length of 250e 300 km and a south-north length of about 50 km.