Architecture and paleogeography of the Early Paleozoic carbonate systems in the east-central Tarim Basin (China): Constraints from seismic and well data

Huang, Yu‐An; Tang, Fan; Berra, Fabrizio

doi:10.1016/j.marpetgeo.2019.104147

Cited by 9 publications

(1 citation statement)

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“…It has undergone a sequence of low-high-low stages. The deposition process includes semirestricted platform deposition, open platform deposition, platform margin deposition, platform margin slope deposition, and shallow-water shelf deposition, – resulting in the formation of multiple sedimentary layers and lithological combinations. The Ordovician system is predominantly composed of carbonate rocks with only the Sangtamu Formation showing clastic sedimentation.…”

Section: Geological Settingmentioning

confidence: 99%

Characteristics of Chaotic Weak Reflection in Carbonate Fracture–Cavity Reservoirs: A Case Study of Ordovician Reservoirs in Block 10 of the Tahe Oilfield, Tarim Basin, China

Sun,

Yang,

Yang

et al. 2023

ACS Omega

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The identification of carbonate reservoirs is a critical task in oil and gas exploration. Chaotic weak reflection is an important type of reflection characteristic in carbonate reservoirs. Widespread distribution of chaotic weak reflection has been observed in the Ordovician Yijianfang Formation in the Tahe area. However, there is still a lack of systematic research on the distribution, characteristics, reservoir space, and reservoir types of chaotic weak reflection in the Tahe area. To address this issue, this study conducted a comprehensive analysis of multiscale data and found that chaotic weak reflections are distributed within 100 ms below the top interface of the Middle Ordovician. Seismic profiles exhibit a “string of pearls” with a “tail” or “pearl-like” widening feature. On well logs, all three porosity curves exhibit localized peaks, with increases in acoustic (AC) and compensated neutron (CNL) and decreases in density (DEN), while the deep and shallow lateral resistivity (RD, RS) curves show positive amplitude differences. In the FMI, they are represented by dark sinusoidal curves and dark small patches. Based on these response characteristics, two types of reservoir spaces are identified for chaotic weak reflections: high-angle vertical fractures and caves with heights less than 7 m, which can form independent reservoirs or fracture–cavity complexes. Three types of reservoirs are distinguished: fracture, cavity, and cavity-fracture types.

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Section: Geological Settingmentioning

confidence: 99%