Analysis of Reservoir Formation Conditions of Gravity Flow Fan in Tadong

Abstract

The Luoxi platform margin belt in Tadong area is a platform margin belt inherited and developed from middle-late Cambrian to early-middle Ordovician [1]. As its gradient is great, large-scale gravity flow slope fan developed at the foot of platform margin of early-middle Ordovician. The reflection characteristics of fan body on seismic section are clear. A single fan is a hilly shape with a disorderly weak reflection inside. There is a continuous reflection of the medium strong amplitude between the fan bodies. Based on the seismological characterization and the Ordovician stratigraphic classification and correlation around sections of Tarim Basin, the Yijianfang Formation, Yingshan Formation and Heituwa Formation of the lower and middle Ordovician gravity flow slope fan body and platform facies in the Luoxi slope belt are basically isochronized. But the sedimentary facies are different. The source of the gravity flow fan body is from the limestone of platform facies, which accumulates at the foot of the slope and forms the gravity flow slope fan body. The field outcrop and drilling in other blocks of the same type of fan indicate that the gravity flow fan reservoir is well developed. There is a very suitable source-reservoir-cap association in the fan body. There does not develop fracture in later period and has good preservation and favorable forming condition. The gravity flow slope fan of Luoxi slope is the new exploration area which first discovered in the eastern of Tarim Basin.

Copyright 2018, Shaanxi Petroleum Society.

This paper was prepared for presentation at the 2018 International Field Exploration & Development Conference in Xi’an, China, September 18–20, 2018.

This paper was selected for presentation by the IFEDC&IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC&IPPTC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC&IPPTC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC&IPPTC. Contact e-mail: paper@ifedc.org.