多期三角洲叠加层序的体系域划分——以渤海海域BZ19-4区东二层序为例

SYSTEM TRACT DIVISION OF MULTI-PERIODIC PROROGATION DELTA SEQUENCE,WITH AN EXAMPLE FROM THE DONG 2 SEQUENCE IN THE BZ19-4 AREA,BOHAI SEA

针对具有歧义的多期三角洲叠加层序的体系域划分问题,从层序地层划分的基础是沉积环境变化的同步性出发,以直接反映环境变化的孢粉、藻类为基础,结合岩性、电性特征、地震反射特征,解决了类似渤海海域渤中凹陷BZ19-4区多期三角洲叠加东二层序的体系域划分问题,指明了正确划分的方法与依据,同时也阐明了体系域划分对油气勘探的重要意义。

To understand the systems tract division of multi-periodic prorogation delta sequences, the author analyzed the Dong2 Sequence in the BZ19-4 area, Bohai Sea. On the basis of synchronous environmental events and palynological, lithostratigraphic, log, and seismic data, systems tract division of the Dong2 Sequence in the BZ19-4 area was attempted. The results have implications for oil and gas exploration.