库车坳陷DB气田白垩系巴什基奇克组砂岩的多期溶蚀

doi:10.11743/ogg20160411

Abstract

Abstract: Characteristics and genesis of dissolution and its influence over pores in sandstone reservoirs of the Cretaceous Bashijiqike Formation in DB gas field of Kuqa Depression are studied based on observation of cores,and normal/cast thin sections,analyses through cathodoluminescence microscope,scan electricity microscope,and characterization of reservoir physical properties,and etc.The result shows that the sandstone reservoirs in the Formation have ultra-low porosity and permeability and contain various types of dissolved pores.The reservoirs had experienced successively atmospheric water supergene leaching (dissolving carbonate cementation),organic acid dissolution (dissolving feldspar),weak alkaline dissolution (dissolving unstable debris),and less weak alternative acid/alkali dissolution(dissolving quartzose),resulting in intergrannular dissolution pores,dissolution fractures,large dissolution pores surpassing grain size,intragranular dissolution pores,and etc.A combination of the study with previous analyses,including stratigraphic burial history,and evolutionary history of organic matter and tectonics of the Formation,indicates that right timing between multi-staged dissolution and hydrocarbon charge was critical for forming prolific DB field.

Key words: multi-stage dissolution, sandstone, Bashijiqike Formation, Cretaceous, gas field, Kuqa Depression

CLC Number:

TE122.2

Yuan Jing, Cheng Ronghong, Zhu Zhongqian, Yang Xuejun, Yuan Lingrong, Li Chuntang. Multi-staged dissolution of sandstone in Cretaceous Bashijiqike Formation in DB gas field of Kuqa Depression,Tarim Basin[J]. Oil & Gas Geology, 2016, 37(4): 546-555.

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Multi-staged dissolution of sandstone in Cretaceous Bashijiqike Formation in DB gas field of Kuqa Depression,Tarim Basin

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