Abstract:

Ludong Depression is the peripheral exploratory area of Liaohe Oilfield Company. Based on the seismic reflection
termination relationship and the regional geological background, the Jiufotang Formation and Shahai Formation in Ludong
Depression can be divided into two seismic sequences, i.e., the Jiufotang sequence and shahai sequence. According to the internal
reflection texture and external geometric configuration and in combination with the parameters of amplitude and continuity, six
seismic facies are identified in the target sequences of the study area, including parallel sheet, sub-parallel sheet, wedge shaped,
foreset, unorganized and lenticular seismic facies. And their characteristics are described in detail. These seismic facies show
variations in horizontal distribution and are successive and evolutionary vertically. Seismic facies are correlated to sedimentary
facies through a comprehensive interpretation. The seismic-sedimentary facies model of each sequence is established according to
the lacustrine sedimentary theory. The results show that the sedimentary facies of fan delta, nearshore submarine fan, turbidite fan
and lake was developed in the target sequences.

Key words: seismic sequence, seismic facies, sedimentary facies, Ludong depression, Kailu Basin