Abstract
Abstract Mesozoic intrusive bodies play an important role in the temperature history and hydrocarbon maturation of the Jinyang Basin in northeastern China. The Beipiao Formation, which is the main source rock in Jinyang Basin, was intruded by numerous igneous bodies and dykes in many areas. The effects of igneous intrusive bodies on thermal evolution and hydrocarbon generation and migration in the Beipiao Formation were investigated. A series of samples from the outcrop near the intrusive body were analyzed for vitrinite reflectance (R 0%) and other organic geochemical parameters to evaluate the lateral extension of the thermal aureole. The R 0 values of the samples increase from a background value of ∼0.9% at a distance above 200 m from the intrusive body to more than 2.0% at the vicinity of the contact zone. The width of the altered zone is equal to the thickness of the intrusive body outcropped in the field. Organic geochemical proxies also indicate the intrusive body plays a positive and beneficial role in the formation of regional oil and gas resources. Due to the influence of the anomalous heat from the intrusive body, the hydrocarbon conversion rate of the source rocks of the Beipiao Formation was significantly improved. The accumulation properties and the storage capacity of the shales also greatly improved due to the intrusive body as indicated by the free hydrocarbon migration in the shales. This new understanding not only provides a reliable scientific basis for the accurate assessment of oil and gas genesis and resources in the Jinyang Basin but also provides guidance and reference for oil and gas exploration in the similar type of basin.
Highlights
Igneous intrusions are common in many sedimentary basins and had been much talked about for their significance effect on organic rich source rocks [1,2,3,4,5,6,7,8,9,10,11]
The thermal effects of igneous intrusions have been discussed in numerous studies, few studies talked about its effects on hydrocarbon generation and expulsion in organic rich host
The oil and gas survey in this area suggested that the Jinyang Basin is a petroliferous basin with significant resource potentials, and the most significant hydrocarbon source rock is the early Jurassic Beipiao Formation
Summary
Igneous intrusions are common in many sedimentary basins and had been much talked about for their significance effect on organic rich source rocks [1,2,3,4,5,6,7,8,9,10,11]. The oil and gas survey in this area suggested that the Jinyang Basin is a petroliferous basin with significant resource potentials, and the most significant hydrocarbon source rock is the early Jurassic Beipiao Formation. The extent of the altered width (thermal aureoles) induced by the igneous activity, and its impact on hydrocarbon generation and expulsion in the basin are not well known in this area. This work intends to make clear the factors that determine the width of contact aureole and understand the factors that affect hydrocarbon expulsion efficiency in the vicinity of igneous intrusions
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