Elang Sandstone Diagenesis in Sahul Block of Bonaparte Basin, Australia

Abstract

Abstract:

Elang sandstone formation (deltaic to shallow marine) is the significant reservoir in the Sahul block of Bonaparte Basin. The drilling data results indicate that the reservoir property has high quality in the north and poor one in the south. This thesis studies the diagenesis of Elang sandstone by impregnated thin-section, scanning electron microscopy, X-ray diffraction and so on, and points out that the diagenesis between the north and the south in the Sahul block is quite different. The diagenesis in the north is in the middle stage of A1 and includes cementation and dissolution, whereas in the south it is from the middle stage of A2 to the middle stage of B and consists of mechanic compaction, cementation and metasomatism. The difference of diagenesis is the key factor affecting the porosity of Elang sandstone reservoir as well as resulting in the difference of reservoir quality between the north and the south. Therefore, it is highly practical and important for reservoir appraisal in studying such differences among various areas and predicting favorable reservoir.

Key words: Bonaparte Basin, Sahul block, Elang sandstone, difference of diagenesis, reservoir property

CLC Number:

TE122.2

LEI Jing-Mei, CHEN Jing-Yang, JIANG Pei-Hai, TAN Zhuo. Elang Sandstone Diagenesis in Sahul Block of Bonaparte Basin, Australia[J]. Geoscience, 2011, 25(1): 78-84.

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