In Yinggehai Basin, an important area for offshore gas exploration in China, rapid filling and deposition caused undercompaction of a massive layer of mudstone. Several diapiric anticlinal structures formed in the center of this basin under the effect of deep hot fluids, making Yinggehai Basin a favorite area for exploration of oil and gas. Estimated gas reserves in the shallow areas are about 200 billion m3.

However, these anticlinal structures on P-wave seismic profiles were unclear and became known as “fuzzy zones.” Interpretation of the fuzzy zones has changed several times during the exploration of the area. During...

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