陆相断陷盆地基准面调控下的古地貌要素耦合控砂机制

发布时间：2018-12-22 07:54

【摘要】：针对陆相断陷盆地砂体分布规律的复杂性,提出一种立足于整个"物源-搬运-沉积"过程的基准面调控下物源体系、沟谷体系、坡折体系3大古地貌要素耦合的砂体预测方法。该控砂机制以基准面为杠杆,以靠近湖盆边缘的平衡位置为支撑点,以古地貌要素为研究对象,强调动态因素调控静态因素,并充分考虑了流态转换和砂体成因。古地貌要素耦合方式理论上有8种,分别对应最差至最优的不同耦合沉积效应。在基准面升降过程中"跷跷板"效应的影响下,陆相断陷盆地中古地貌要素的耦合方式发生改变,导致砂体的成因、迁移方式和沉积环境等显著变化,进而控制砂体的分布规律。在该控砂机制指导下,分析了苏北盆地高邮凹陷和北部湾盆地涠西南凹陷的砂体发育规律,取得了良好的砂体预测效果,验证了控砂机制的有效性和实用性。
[Abstract]:In view of the complexity of sand body distribution in continental faulted basin, a provenance system, gully system, is proposed, which is based on the whole process of "provenance-transportation-sedimentation". Sand body prediction method with three major paleogeomorphic elements of slope break system. The sand control mechanism takes the reference level as lever, the equilibrium position near the margin of the lake basin as the supporting point, and paleogeomorphic elements as the research object, emphasizes the dynamic factors to regulate the static factors, and fully considers the flow state transformation and the formation of the sand body. There are eight coupling modes of paleogeomorphic elements in theory, corresponding to the worst to optimal coupling deposition effects respectively. Under the influence of "seesaw" effect in the process of base level rise and fall, the coupling mode of paleogeomorphological elements in continental faulted basins has changed, resulting in significant changes in the genesis, migration mode and sedimentary environment of sand bodies. Then the distribution of sand body is controlled. Under the guidance of the sand control mechanism, the development law of sand body in Gaoyou sag of Subei basin and Weisouthwest sag of Beibu Bay basin is analyzed, and good sand body prediction effect is obtained, which verifies the validity and practicability of sand control mechanism.
【作者单位】：华北理工大学矿业工程学院;长江大学地球科学学院;
【基金】：河北省自然科学基金(D2013209045)
【分类号】：P618.13

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