地层古厚度定量恢复方法研究及应用——以准噶尔盆地陆东地区为例

RESEARCH ON QUANTITATIVE RESUMPTION METHOD OF STRATUM PALEOTHICKNESS AND ITS APPLICATION——AKING LUDONG AREA IN ZHUNGE’ER BASIN AS AN EXAMPLE

文章提出了一种地层古厚度恢复的方法,利用该方法恢复了研究区的埋藏演化历史;根据该方法恢复后的地层古厚度制作的埋藏史曲线真实地展现了该区经历了“两快两慢、三次抬升”的埋藏演化过程;分析认为该区的埋藏史可以分为2种类型持续沉降型和早期快速沉降型。其中,早期快速沉降型能否成为油气成藏的关键是保存条件。通过上述研究发现石炭系烃源岩在侏罗系八道湾组沉积末期开始生、排烃,在西山窑组沉积末期达到成熟—高成熟,开始大量的生、排烃。

A method of resuming stratum paleothickness is proposed out in this paper to display burial and evolution history of Ludong area, analyze the oil-gas reservoiring period, comprehensively consider compaction and denudation and set up the geological model. The burial and evolution history of the area is resumed by the method. The burial and evolutional process of “two-quick two-slow, three-lift” in the area is really displayed in the burial history curve made from stratum paleothickness resumed by the method. It is considered that the burial history of the area can be divided into two types: i.e. sustained subsiding and early rapid subsiding, and the preservation condition is the key factor whether the early rapid subsiding changed into oil-gas reservoiring or not. Through the above study, the source rock of Carboniferous System began generating and discharging hydrocarbon at the last sedimentary stage of Jurassic Badaowan formation, got into mature-high mature period at the last sedimentary stage of Xishanyao Formatin and began largely generating and discharging hydrocarbon.