1. The formation under Neocene in this well was composed of brown, bluish grey and grey mudstone and linen micropsammite and siltstone.

2. The seal rocks are developed widely, and the Neocene marine mudstone is the regional seal.

3. The seal develop widely, and Neocene marine mudstone is the regional seal.

4. The volcanic rocks of Neocene and Eogene in Nanpu depression is mainly distribute in Ng, Ed and Es formation.

5. But faults activities incredibly weak, most of the faults didn't active in Neocene tectonic period in this area.

6. The Maoming Basin belongs to a half graben-like faulting basin of extension regime. The oil shales are found both in the Palaeogene Youganwo Formation and in the Neocene Shangcun Formation.

7. The main oil-bearing strata of the Taiping oil field is the lower Guantao Formation in Neocene, and its characteristic is a typical meshwork-carpet oil and gas accumulation system.

8. Therefore, the authors consider that the basin was an asymmetrical strike-slip pull-apart basin in the Palaeogene but becomes a compressive depression basin in Neocene.

9. Actually, Keping fault-uplift, under which there exists a paleouplift as a part of Bachu fault-uplift, is an overthrust belt formed during Neocene Kuche period.