四川盆地东部中二叠统茅口组热液白云岩发育模式及对储层的改造

doi:10.11743/ogg20200112

Abstract

Abstract:

Based on the distribution of abnormal dolomites in the Maokou Formation, eastern Sichuan Basin, we analyzed the identification markers and timing of hydrothermal dolomitization (HTD), and discussed its genetic model and reservoir modification by means of petrological description of cores, geochemical testing, as well as comprehensive interpretation of seismic and logging data. The results indicate that the main identification markers include irregular dolomite distribution, medium-to-coarse crystalline matrix dolomite, saddle dolomite and quartz-saddle dolomite in the earlier tensile fractures and cavens. The homogenization temperature of dolomite fluid inclusions(115-145℃)being higher than the host formations, more negative oxygen isotope (δ¹⁸O(VPDB)-5.4‰-7.1‰), and increased strontium isotope (⁸⁷Sr/⁸⁶Sr 0.707 947-0.708 458) are the main geochemical indicators of hydrothermal activities. HTD mainly occurred near tensional or transtentional fault systems, and its stratification is controlled by original sedimentary facies. The limestone formations near the fracture/fault zones were also altered by hydrothermal fluids. The main stage of HTD alteration is the Late Permian-Middle Triassic after the shallower burial and karstification via uplifting and explosion of the Maokou Formation and the deposition of the Wujiaping Formation. The eruption of Emei basalt served as heat source for hydrothermal fluids, and the factors such as faults, sedimentary facies and the intrusion of hydrothermal fluids are coupled in time and space, resulting in the development and various distribution patterns of hydrothermal dolomites. The effect of HTD on reservoir modification is complex.The newly-generated pore space is not remarkable in lower-permeability limestones under HTD, while the high-energy beach facies with initial pores may preserve certain porosity and permeability under HTD.

Key words: hydrothermal dolomitization(HTD), identification marker, reservoir modification, Maokou Formation, Sichuan Basin

CLC Number:

TE122.2

Tao Zhang, Juanhua Lin, Yueqing Han, Zeyu Wang, Jun Qin, Rongqiang Zhang. Pattern of hydrothermal dolomitization in the Middle Permian Maokou Formation, eastern Sichuan Basin, and its alteration on reservoirs herein[J]. Oil & Gas Geology, 2020, 41(1): 132-143, 200.

Figures/Tables 12

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Pattern of hydrothermal dolomitization in the Middle Permian Maokou Formation, eastern Sichuan Basin, and its alteration on reservoirs herein

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