Sedimentary Sequence Evolution and Reservoir Characteristics in the Changling Area, Songliao Basin
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摘要: 研究基准面升降和可容纳空间增减的变化，将长岭地区坳陷层泉四段—嫩一段地层划分为5个三级层序、8个四级层序，建立高精度层序地层格架。其地层纵向上表现为两期三角洲与湖泊沉积体系交互叠置的演化序列，反映出两次大的湖平面旋回变化。在层序地层格架内分析成藏要素的发育特征及其与沉积层序演化的有机联系。将坳陷期地层划分为三套有成因联系的油气成藏组合，下部组合成藏条件匹配最佳，中部组合各成藏要素十分发育，关键在于储层与油源之间的运移通道。总结区域油气成藏地质规律，认为层序旋回控制油气聚集部位，主力含油层位靠近成熟烃源岩；沉积相带控制储层发育区域，三角洲前缘砂体油气显示多且含油气性好，为有利储集相带。由成藏要素分布特征与成藏组合条件的双重制约，预测长岭地区油气成藏有利部位呈环带状分布于坳陷东北部的三角洲前缘与滨浅湖的交互区域。
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关键词:
- 长岭地区坳陷层沉积层序成藏要素成藏组合
Abstract: By studying how base level and accommodation space change the strata between the forth member of Quantou Group and the first member of Nenjiang Group in Changling Depression Basin. The sequence stratigraphy has been devided into five third sequences and eight forth sequences, and high resolution sequence formation framework has been built up. Double delta sediments and lake sediments superimposed vertically because of twostage cycles of lake level. By analysising the relationship between elements of reservoir and development of sedimentary sequence in the sequence framework, the formation in depression contained three sets of allied reservoir plays. The lower play had good genetic conditions and the middle one's conditions were also good if migration pathway were unblocked. The rule of reservoir formed in this area has been concluded as follows. Firstly, sequence and cycle controlled where petrol accumulate and the main reservoirs lay near hydrocarbon rocks. Secondly, sedimentation zone controlled the distribution of reservoir, delta front sand bodies which contained more and better oil and gas were good reservoirs. In accordance with restriction of reservoir factors' combination and distribution, it is predicted that good reservoir of Changling area distributed
in delta front and shorenear crossover region.-
Key words:
- Changling region
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