Oriente盆地D-F油田泥岩墙成因及其对油藏分布的影响

doi:10.11743/ogg20170616

Abstract

Abstract: Two mudstone dikes formed in the M1-SS layer of D-F oilfield,Oriente Basin,Ecuador,were studied to characterize their vertical and planar distribution based on drilling,logging and seismic data,and to analyze the factors that controlled their formation in respects of sedimentary setting and differential compaction process.Their impact upon the distribution of oil accumulations in the oilfield was also discussed in the paper.Both NW-SE-trending dikes are characterized by higher clay content in well logging and low amplitudes in seismic data.The study suggests that the dikes correspond to hybrid sand-mud flat microfacies in a tide-dominated estuarine environment and have higher clay content than surrounding sand flat and sand bar microfaices.Therefore,after differential compaction,the sand-mud flat ended up with a thinner thickness of M1-SS and even formed tiny faults at the edge of dikes.Besides,the presence of the dikes affected the reservoir heterogeneity and decreased the continuity of the sandbodies in M1-SS,thus blocked lateral migration of hydrocarbons.As a result,the oil accumulation to the east of the source rock-rooted fault was compartmentalized into five small reservoirs.

Key words: differential compaction, seismic attribute, tide-dominated estuarine, mudstone dike, Oriente Basin, Ecuador

CLC Number:

TE112.1

Yang Jinxiu, Zhang Kexin, Chen Heping, Lu Shuangfang, Wan Xuepeng, Tang Mingming, Xiao Dianshi, Zhang Chaoqian. Genesis of mudstone dikes and their impact on oil accumulations in D-F oilfield of Oriente Basin,Ecuador[J]. Oil & Gas Geology, 2017, 38(6): 1156-1164.

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Genesis of mudstone dikes and their impact on oil accumulations in D-F oilfield of Oriente Basin,Ecuador

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