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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/07202017327
Origin and charging histories of diagenetic traps in the Junggar Basin
Jianguo Pan,1 Guodong Wang,2 Yongqiang Qu,3 Wen Qi,4 Lu Yin,5 Duonian Xu,6 Tuanyu Teng,7 Bin Wang,8 Kaijun Tan,9 and Linjun Huang10
1Key Laboratory of Reservoir Characterization, PetroChina, Lanzhou, Gansu, China; Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
2Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
3Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
4Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
5Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
6Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
7Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
8Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
9Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
10Research Institute of Petroleum Exploration & Development–Northwest, PetroChina, Lanzhou, Gansu, China; [email protected]
ABSTRACT
Oil and gas accumulations in the sandy conglomerate diagenetic traps that developed in the fan delta of the Triassic Baikouquan Formation of the Mahu sag, Junggar Basin, differ from stratigraphic accumulations controlled by sedimentary facies. This study uses conventional gas chromatography–mass spectrometry measurements, mineralogical and petrological data, fluid inclusion analyses, and geophysical inversion to confirm the trap
type and accumulation processes. The results indicate that accumulations in the sandy conglomerate formed in distributary channels of the fan-delta front, with the boundary controlled by reservoir quality. In turn, reservoir quality was controlled by differential diagenesis caused by detrital-feldspar content, paleotemperature, and formation fluids, suggesting that the
trap
is a diagenetic
trap
. The diagenetic
trap
formed from secondary pores developed in the fan-delta front facies with seals forming through a combination of altered sandy beds and mudstone. The critical physical property of the reservoir, based on the ratio of its average capillary radius to the ratio of its seal, is a crucial parameter for describing diagenetic
trap
boundaries. Here, it effectively distinguishes between reservoirs at different burial depths. A good correlation exists between the formation of the diagenetic traps and hydrocarbon filling. Three hydrocarbon charging and two accumulation stages are identified. The diagenetic traps primarily formed in the Jurassic, and the last charging stage of highly mature oil charge occurred in the Early Cretaceous. Few studies have investigated the conglomerate diagenetic
trap
studied herein, so this study should improve the understanding of oil and gas traps.
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