Hydrocarbon Kitchen Evolution in the Early Cretaceous Bayingebi 2 Formation in the Chagan Depression, Yingen-Ejinaqi Basin, North Central China

Abstract

The Chagan Depression is an important oil and gas exploration tectonic unit in the Yingen-Ejinaqi Basin, north central China. It has been revealed that the Chagan Depression has abundant oil and gas resources, but the study of hydrocarbon kitchens has not been carried out. The Early Cretaceous Bayingebi 2 Formation has the most important source rocks in the Chagan Depression. In this paper, the Bayingebi 2 Formation was selected to study the hydrocarbon kitchen evolution. The thermal maturity evolution of the source rocks and the locations and geological time of the development of hydrocarbon kitchens were revealed. The results show that the maturity of source rocks in the Bayingebi 2 Formation has reached the maximum during the middle depositional period of the Yingen Formation, and the hydrocarbon generation has ceased since the Late Cretaceous. The source rocks of the Bayingebi 2 Formation in the Chagan Depression have two hydrocarbon kitchens, namely, the western subdepression and the eastern subdepression hydrocarbon kitchens. The western subdepression hydrocarbon kitchen was formed in the Suhongtu 1 Formation depositional period and ended in the Yingen Formation depositional period. The location of the hydrocarbon kitchen was relatively stable and developed in the central and southern parts. However, the eastern subdepression hydrocarbon kitchen developed only during the Yingen Formation depositional period and was located in the north subsag of the Hantamiao sag zone. Finally, the evolution of the hydrocarbon kitchen reveals that oil and gas exploration still needs to be carried out around the western subdepression hydrocarbon kitchen and it may be considered to abandon the exploration in the eastern subdepression.

Gas–Source Comparison and Hydrocarbon Generation and Expulsion Histories of the Main Source Rocks of the Middle Jurassic Shaximiao Formation, Western Sichuan Basin

“…This study utilizes basin modeling technology to reconstruct the hydrocarbon generation and expulsion histories of representative wells and source rock series, enabling a dynamic assessment of the source rocks. ,, On the basis of geological parameters, source rock parameters, and thermal parameters, this study uses BasinMod 1D software to model the maturity evolution of source rocks and the hydrocarbon generation and expulsion histories of representative wells. Based on the modeling results of wells, the key geological periods of lateral modeling are determined: the end of the Late Triassic (195 Ma), the end of the Middle Jurassic (160 Ma), the end of the Early Cretaceous (100 Ma), and the present-day (0 Ma).…”

Study on the Applicability of Saturated Hydrocarbon Parameters in the Evaluation of Lacustrine Source Rocks and Oils Based on Thermal Simulation Experiments

“…The Yingen-Ejinaqi Basin is located in the Inner Mongolia Autonomous Region of northwest China (Figure 1a), which is a Mesozoic rift basin developed on the Precambrian crystalline block and Paleozoic fold basement [35][36][37][38][39]. Suhongtu depression (longitude 102 • 05 -106 • 10 , latitude 40 • 50 -41 • 50 ) is a secondary tectonic unit of Yingen-Ejinaqi Basin, which is located in the north part of the basin (Figure 1b) [40,41]. The sedimentary strata of the Suhongtu depression include the Lower Cretaceous Bayingobi formation (K 1 b), Suhongtu formation (K 1 s) and Yingen formation (K 1 y), the Upper Cretaceous Wulansuhai formation (K 2 w) and the Quaternary from bottom to top.…”

“…The sedimentary strata of the Suhongtu depression include the Lower Cretaceous Bayingobi formation (K 1 b), Suhongtu formation (K 1 s) and Yingen formation (K 1 y), the Upper Cretaceous Wulansuhai formation (K 2 w) and the Quaternary from bottom to top. The main exploration target Bayingobi formation can be divided into three sections, namely the first member of the Bayingobi formation (K 1 b 1 ), the second member of the Bayingobi formation (K 1 b 2 ) and the third member of the Bayingobi formation (K 1 b 3 ) from bottom to top, respectively (Figure 1c) [36,40,41]. Among them, K 1 b 2 was mainly formed in a deep-semi deep lake environment, dominated by fine sediment, and formed the main source rock within the basin [42][43][44][45].…”

“…Processes 2023, 11, x FOR PEER REVIEW 3 of 18 102°05′-106°10′, latitude 40°50′-41°50′) is a secondary tectonic unit of Yingen-Ejinaqi Basin, which is located in the north part of the basin (Figure 1b) [40,41]. The sedimentary strata of the Suhongtu depression include the Lower Cretaceous Bayingobi formation (K1b), Suhongtu formation (K1s) and Yingen formation (K1y), the Upper Cretaceous Wulansuhai formation (K2w) and the Quaternary from bottom to top.…”