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东营凹陷在沙河街组沉积期为北陡南缓的箕状断陷湖盆,凹陷内可进一步细分为陡坡带、缓坡带、洼陷带及中央背斜带。在沙河街组成岩演化过程中发育了多种类型的成岩作用,主要包括压实作用、压溶作用、溶解作用、胶结作用等。不同构造区带成岩作用具有明显的差异性,具体表现为:压实作用总体表现为早期压实影响较大,后期较小,但不同构造区带差异明显;胶结作用在不同构造区带碳酸盐胶结胶物含量不同。不同粘土矿物在不同构造区带含量及转化深度不同;溶蚀作用在不同构造区带发育深度不同,从而导致次生孔隙带发育深度均明显不同。不同构造区带成岩作用的差异性导致不同构造区带成岩相带类型、特征不同。详细研究这种差异性对于寻找岩性油气藏具有重要的理论价值和实际意义。
Dongying sag is deposited in the Shahejie Formation, a north-easterly graben-shaped rift lake basin, which can be further subdivided into steep slope zone, gentle slope zone, subsidence zone and central anticline zone. During the evolution of sedimentary rocks in Shahejie, many types of diagenesis were developed, including compaction, pressure solution, dissolution and cementation. The diagenesis of different tectonic zones has obvious difference, which is manifested in the following aspects: the overall compaction effect is that the early compaction has a greater influence and the later period is smaller, but the difference in different tectonic zones is obvious; Salt glue different content. Different clay minerals have different contents and transformation depths in different tectonic zones; dissolution has different developmental depths in different tectonic zones, resulting in significantly different secondary pore depths. The diagenesis of different tectonic zones leads to diagenetic facies types in different tectonic zones with different features. Studying this difference in detail has important theoretical and practical significance for finding lithologic reservoirs.