准噶尔盆地沙湾凹陷侏罗系八道湾组滩砂的发现及石油地质意义

doi:10.12108/yxyqc.20230501

Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 1-10.doi: 10.12108/yxyqc.20230501

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Discovery and petroleum geological significance of beach sand bodies of Jurassic Badaowan Formation in Shawan Sag，Junggar Basin

LIU Guoyong¹, XU Duonian², HU Tingting³, PAN Shuxin², PAN Tuo³, WANG Guodong², MA Yongping², GUAN Xin²

1. PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
2. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
3. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Urumqi 830013, China

Received:2022-10-12 Revised:2023-05-08 Online:2023-09-01 Published:2023-09-28

Abstract

Abstract: Beach sand body is one of the essential reservoir types in continental basins in China. Based on core testing， drilling，logging and 3D seismic data，the sedimentary characteristics of the beach sand bodies of Jurassic Badaowan Formation in Shawan Sag of Junggar Basin were systematically analyzed，and their distribution，depositional model and exploration potential were discussed. The results show that：（1）The beach sand bodies of Badaowan Formation in Shawan Sag comprise beach ridges and troughs. The beach ridges are rich in sand，mainly composed of sandy conglomerate，pebbly sandstone and sandstone，with massive bedding，wave cross-bedding and local soft sedimentary deformation bedding being developed，showing multi-phase beach ridge superposition. The beach trough is poor in sand and dominated by thin siltstone，with reversed grain sequence in vertical. The single beach ridge comprises three sedimentary sequences， and each sequence has grain size probability curves in three-stage.（2）The beach ridges in the study area show a reflection characteristic of strong amplitude lenticular discontinuity on seismic section，and the stratal slices show beach ridges distributed in rows and belts along the lake shoreline. Beach sand bodies are distributed in strips along the lake shorelines in the recessed area between the two big delta fan bodies in the west ring belt， and beach ridges and troughs are distributed alternately. The single beach ridge has small area， with large number，up to 12. Appearing in groups and belts，the area of beach ridge sand body group is up to 145 km².（3）The ridged trough beach sand bodies at the bottom of Badaowan Formation in the study area have excellent exploration and development potential，with a considerable thickness of sand bodies， good physical properties，and a wide distribution area. The trough can be used as a lateral barrier layer to form suitable reservoirs and traps. The high-quality source rocks of the alkaline lake of Permian Fengcheng Formation provide oil and gas sources， and the unconformity surface and faults are favorable oil and gas transport systems.

Key words: beach sand bodies, beach ridge, beach trough, delta front sand bodies, depositional model, Badaowan Formation, Jurassic, Shawan Sag, Junggar Basin

CLC Number:

TE122.1

LIU Guoyong, XU Duonian, HU Tingting, PAN Shuxin, PAN Tuo, WANG Guodong, MA Yongping, GUAN Xin. Discovery and petroleum geological significance of beach sand bodies of Jurassic Badaowan Formation in Shawan Sag，Junggar Basin[J].Lithologic Reservoirs, 2023, 35(5): 1-10.

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