Lithologic Characteristics and Geological Implication of Fine-grained Sedimentation in Ek2 High Stand System Tract
of Cangdong Sag, Huanghua Depression

Abstract

Abstract: Lithologic character is one of the main controlling factors for development of tight oil sweet spot. The Ek₂ layer of Cangdong sag, Huanghua depression, is rich in tight oil resource. To clarify the lithologic development characteristics of fine-grained Ek₂ sedimentation, highresolution sequential stratigraphy and tight oil and gas abundance geological theory are used to make high-resolution sequence stratigraphic division of the Ek₂ layer and analyze its sedimentary characteristics on the basis of coring, testing, logging and well-log data. The study indicates that theEk₂ layer in Cangdong sag is a set of intact three-order sequences, which can be further divided into four-order sequences (SQEk₂ ¹—SQEk₂ ⁴). Fine-grained sedimentation in SQEk₂ ¹ high stand system tract is complicatedly composited without favorable minerals development. It is characterized in extensive distribution of brittle minerals, such as muddy felsites debris and analcite. Four main types of rock developed in the area – shale, dolomite, sandstone and mixed sedimentary rock, of which mixed sedimentary rock developed best. Tight sandstone and dolomite are the main reservoirs. The research results refresh the previous views that shale developed as source rock in finegrained sedimentation of Ek₂ layer in Cangdong sag but no reservoirs developed there, effectively expand the oil and gas exploration field in Cangdong sag.

Key words: tight oil, fine-grained sedimentation, dolomite, Ek2, Cangdong sag, Huanghua depression

Pu Xiugang,Han Wenzhong, Zhou Lihong, Chen Shiyue, Zhang Wei, Shi Zhannan, Yang Fei, Liu Sa. Lithologic Characteristics and Geological Implication of Fine-grained Sedimentation in Ek2 High Stand System Tract of Cangdong Sag, Huanghua Depression[J]. China Petroleum Exploration, 2015, 20(5): 30-40.

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Lithologic Characteristics and Geological Implication of Fine-grained Sedimentation in Ek2 High Stand System Tract of Cangdong Sag, Huanghua Depression

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