渤海埕岛油田东斜坡古近纪东营组划分与对比及沉积

Classification, Contrast and Sedimentary of Taleogene Period Dongying Formation in East Slope of Chengdao Oil Field in Bohai Sea

摘要:

埕岛油田是我国浅海—极浅海海域的第一个大型油田,该油田东斜坡古近纪东营组油层发育良好,但沉积环境变化较大,对准确进行地层对比和沉积特征分析造成了影响。本文从层序地层学入手,应用测井及三维地震资料对该区的东营组进行了划分对比,综合运用了时间地层对比及岩性地层对比两种方法建立了东斜坡东营组对比格架,并在纵向上识别出两套沉积体系:东营组下部为滨浅湖半深湖相水下扇沉积体系,中上部为扇三角洲沉积体系,为该带进行深入的勘探开发提供了重要的地质依据。

Abstract:

Chengdao oil field is the first large-type oil field in shallow sea-super-shallow sea in China. Oil strata developed very well in Talegoene period Dongying formation in east slope of this oil field, but sedimentary environment varied greatly, which caused effect to strata contrast and sedimenttary characteristics analysis correctly. Applying logging and three dimensional seismic information, Dongying formation is classified and contrasted, and using charonostratigraphic contrast method and lithostratigraphic correlation method, contrast framework of east slope in Dongying formation is set up, and 2 sets of sedimentary system are distinguished vertically. Lower part of Dongying formation is shallow-semi-deep submerged fan system, which provide important geological basis for further exploration in this area.