摘要：There are significant differences in the oil and gas phase behavior, distribution depth, and content in deep and ultra-deep strata in the central and western basins in China where the temperature field plays an essential role in hydrocarbon generation and conservation. Focusing on the Cambrian of the Tarim and Sichuan Basins, this study summarizes and contrasts the present-day and ancient temperature fields, and clarifies the maturation history and differences of the Lower Cambrian source rocks. The effect of thermal evolution on hydrocarbon generation and phase behavior is also discussed. The average heat flows in the Tarim and Sichuan basins are (42.5卤7.6) mW/m2 and (53.8卤7.6) mW/m2, respectively, reflecting the characteristics of "cold" and "warm" basins. In the Tarim Basin the paleo heat flow decreased since the Early Cambrian and only peaked abruptly in the Early Permian in response to the Tarim Large Igneous Province. Whilst the Sichuan Basin experienced steady, low heat flow in the Cambrian-Early Permian, rapid rising heat flow at the end of the Early Permian due to the Emeishan mantle plume, and declining heat flow since the Late Permian. The Sichuan Basin's consistent higher thermal regime, and the differential effect of Permian magmatic activity, resulted in the differential oil and gas generation and conservation in the ancient, ultra-deep strata between the two basins. The maturation history of source rocks of the Lower Cambrian Yuertusi Formation in the Tarim Basin can be classified into three kinds: (1) Paleozoic rapid maturation and finalization; (2) Early Paleozoic rapid maturation followed by continuous heating; and (3) Early Paleozoic and Mesozoic rapid maturation. Similarly, three maturation patterns are identified for the source rocks of the Lower Cambrian Qiongzhusi Formation in the Sichuan Basin: (1) continuous maturation; (2) Silurian-Permian cessation followed by Mesozoic maturation; and (3) Silurian-Permian and Triassic cessation and later continuous maturation. Due to its low thermal regime, the Tarim Basin has favorable temperature conditions for the liquid hydrocarbon preservation in ultra-deep strata. 漏 2023 Science Frontiers editorial department. All rights reserved.

ISSN号：1005-2321

卷、期、页：v 30,n 6,p199-212

发表日期：2023-11-01

收录情况：EI（工程索引）

发表期刊名称：Earth Science Frontiers

参与作者：李慧莉,马安来

通讯作者：曾帅,刘效妤

第一作者：邱楠生,常健,冯乾乾

论文类型：期刊论文

论文概要：邱楠生,常健,冯乾乾,曾帅,刘效妤,李慧莉,马安来，Maturation history of deep and ultra-deep source rocks, central and western basins, China，Earth Science Frontiers，2023，v 30,n 6,p199-212

论文题目：Maturation history of deep and ultra-deep source rocks, central and western basins, China