Structural Interpretation of the Qingdong Area in Bohai Bay Basin from Shipborne Gravity Data

Chunguan Zhang,Jingguo Chen,Mingyi Song,Jinkuan Wang,Bingqiang Yuan

doi:10.1515/pomr-2015-0040

Abstract

Abstract The Qingdong area, located in Bohai bay basin, was suspected good exploration prospects. In order to study tectonic features and find out favourable petroleum prospects in the area, the gravity data at a scale of 1:50,000 were interpreted. This paper, through data processing and synthetic interpretation of the high-precision gravity data in the area, discusses characteristics of the gravity field and their geological implications, determines the fault system, analyses features of the main strata, divides structure units and predicts favourable petroleum zones. The results showed that the faults controlled the development of the Mesozoic and Cenozoic strata and the distribution of local structures in this area. The study revealed that the Qingtuozi uplift and the Kendong uplift in the north were formed in Mesozoic, and the Qingdong depression in the middle was the rift basin in Mesozoic and Cenozoic. Thicker strata in Mesozoic and Cenozoic developed in the Dongying depression and the Qingdong depression, so there is abundant hydrocarbon in these two depressions, and then the Guangligang rise-in-sag and the Qingdong rise-in-sag developed in the center in these two depressions are also favorable places for prospecting

Highlights

In recent years, small and medium basins in the eastern China have been paid more attention for hydrocarbon exploration by geologists
Since 1990th, a lot of works have been done in the Qingdong depression by Shengli Oilfield, SinoPec, especially focused on Cenozoic evolution [4,13,15], reservoir conditions and potentiality of hydrocarbon resources [3,12], and good exploration prospects was suspected in the Qingdong depression
Affected by Tancheng-Lujiang fault [2,6], the structures are complicated in this area, and the depression is located in a shallow sea and other factors, more work in details need to be done for properties of basement, structures and sedimentary evolution in the Qingdong depression

Summary

Introduction

Small and medium basins in the eastern China have been paid more attention for hydrocarbon exploration by geologists. In order to study the structural characteristics and determine the distribution of main sedimentary stratum and the contact between tectonic units in Qingdong area, gravity anomaly profiles were used for quantitative interpretation combined with seismic data and well data.

Results

Conclusion