The results indicate the reservoir characteristics and physical property of T1f1-2 is better,its reflection coefficient is bigger than T1f3,and the characteristics of bright spots and dark spots are obvious in Puguang Gasfield.

As a result it has the typical seismic reflection characteristics of gas reservoir: 1) dim spot at top interface of gas reservoir, 2) bright spot at bottom interface of gas reservoir, 3) flat spot at gas-water contact, and 4) seismic response shape of gas reservoir.

The seismic and geologic proof is concluded in this article,which can explain the dim spot existed at the deep Kekeya s E 2 k gas reservoir,from studying the acoustic impedance and the surface reflection coefficient of Kekeya gas-bearing carbonate rock.

We built up a model to identify high efficiency payzones with high permeability by using dim spots of "weak chaotic reflection",and then identified two types of dim spots,i.

Methods Central Scotoma and fixation nature were performed in the patients:20 cases with full-thickness macular hole,10 cases with lamellar macular hole and 10 cases with cystoid macular degeneration.

Practical application of laser optometer for dark focus;