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- Title
Structural characteristics and hydrocarbon accumulation models of Shuangcheng Sag, Songliao Basin.
- Authors
Shi-wei YI; Ming-peng LI; Shu-juan XU; Bao-wen CUI; Qi-an MENG; Xue-qiong WU; Hong-gang CHENG
- Abstract
Songliao Basin is a large-scale petroliferous basin with a dual-texture of depression in Mesozoic. There are numerous sags developed in the fault depression and the exploration degree aimed at those sags is low, which makes it a strategic replacement fields in the future exploration. In the big deep fault depressions such as Xujiaweizi Sag, Changling Sag, great breakthroughs in natural gas exploration have achieved and large-scale reserves have been discovered. However, oil and gas exploration has not made a big breakthrough in other Sags. Recently, the breakthrough of oil exploration in Shuangcheng Sag further confirmed the exploration potential in the depression. Previous studies have shown that the hydrocarbon accumulation and distribution in the fault depression of Songliao Basin are controlled by sag structures. According to the structural characteristics of different areas in Shuangcheng Sag, the structure of it can be divided into six models including central fault horst type, central fault graben type, single fault trough type, double fault trough type, multistage fault type and half fault graben type, and seven accumulation models were accordingly constructed. It is pointed out that the four major complex hydrocarbon accumulation zones including central fault buried hill structural belt, buried hill structural belt of slope fault, buried hill structural belt of steep slope fault and strike-slip anticlinal belt will be the favorable exploration areas in Shuangcheng Sag in the future. The faulted anticline, fault block, fault-nose and buried hill traps are the next exploration targets. For those favorable structural belts, multi-layers and multi-objective types of stereoscopic exploration ideas should be applied, and we should give priority to the central fault buried hill structural belt should be given priority in order to achieve discovery. Then, we can extend the exploration areas to slope fault buried hill structural belt and buried hill structural belt of steep slope fault to realize breakthroughs in new zones. And also we should explore the replacement field of lithologic stratum reservoirs in order to implement the benign development in the exploration of this field.
- Subjects
NATURAL gas prospecting; GRABENS (Geology); PETROLEUM prospecting
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 6, p3
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2020.03.008