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STUDY ON THE SEDIMENTARY MICROFACIES OF THE SHA-3 MEMBER IN BONAN OILFIELD

Dong Hyun Chun

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Abstract

Aimed at high exploration degree of the Sha3 Member in Bonan oilfield, the Bonan Sag of the Middle Zhanhua Depression, the sedimentary microfacies were studied on the base of highresolution sequence stratigraphical research, and sedimentary lobes were found as important targets for hydrocarbon exploration. During the Sha3 period of the Bonan Sag, the essential sources from the Gudao convex and the secondary sources from the Luojia Nose formed the deeplake turbiditefan sedimentary system, including endofan, mesofan and exofan three subfacies and endofan feeding channel, endofan terrace, endofan natural levee, mesofan braided channel, mesofan lobe and exofan sheet sand six microfacies. Among them, the turbiditefan mesofan subfacies was dominant. The mesofan lobes were lensshaped and enclosed by the hydrocarbon source rocks of the Sha3 Member. They formed excellent oil and gas pools of lithologic traps, and were new targets for hydrocarbon exploration in Bonan oilfield.

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What this paper is about

Aimed at high exploration degree of the Sha3 Member in Bonan oilfield, the Bonan Sag of the Middle Zhanhua Depression, the sedimentary microfacies were studied on the base of highresolution sequence stratigraphical research, and sedimentary lobes were found as important targets for hydrocarbon exploration. During the Sha3 period of the Bonan Sag, the essential sources from the Gudao convex and the secondary sources from the Luojia Nose formed the deeplake turbiditefan sedimentary system, including endofan, mesofan and exofan three subfacies and endofan feeding channel, endofan terrace, endofan natural levee, mesofan braided channel, mesofan lobe and exofan sheet sand six microfacies. Among them, the turbiditefan mesofan subfacies was dominant. The mesofan lobes were lensshaped and enclosed by the hydrocarbon source rocks of the Sha3 Member. They formed excellent oil and gas pools of lithologic traps, and were new targets for hydrocarbon exploration in Bonan oilfield.

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Available abstract

Aimed at high exploration degree of the Sha3 Member in Bonan oilfield, the Bonan Sag of the Middle Zhanhua Depression, the sedimentary microfacies were studied on the base of highresolution sequence stratigraphical research, and sedimentary lobes were found as important targets for hydrocarbon exploration. During the Sha3 period of the Bonan Sag, the essential sources from the Gudao convex and the secondary sources from the Luojia Nose formed the deeplake turbiditefan sedimentary system, including endofan, mesofan and exofan three subfacies and endofan feeding channel, endofan terrace, endofan natural levee, mesofan braided channel, mesofan lobe and exofan sheet sand six microfacies. Among them, the turbiditefan mesofan subfacies was dominant. The mesofan lobes were lensshaped and enclosed by the hydrocarbon source rocks of the Sha3 Member. They formed excellent oil and gas pools of lithologic traps, and were new targets for hydrocarbon exploration in Bonan oilfield.

Key concepts: Geology, Sedimentary rock, Turbidite, Lithology, Geochemistry, Sedimentary depositional environment, Paleontology, Petrology

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