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南堡凹陷构造与油气聚集关系复杂,对构造样式及形成机制尚无明晰认识。基于三维地震资料构造解释,选取了两条具有典型构造样式特征的主干地质剖面,设计了剖面砂箱模拟试验,根据试验结果对其构造演化序列进行了分析。结果表明,南堡凹陷邻近边界断层的陡坡带发育滚动背斜顶部塌陷构造,远离边界断层的斜坡区则发育阶梯式或“多米诺”式盆倾断层组,断层组合具有从斜坡区向盆内逐次发育的规律;“卷心菜”式断层组合是早期基底断层重新活动的结果,与走滑作用无关;边界断层几何形态和演化控制了凹陷结构,继而控制了沉积相带的发育,并影响了油气宏观分布规律。综合分析认为,南部斜坡区是有利勘探方向,而斜坡区早期基底断层控制的局部构造带则是最有利的勘探区域。
The structure of Nanpu Sag has a complex relationship with hydrocarbon accumulation, and there is no clear understanding of tectonic styles and formation mechanism. Based on the interpretation of three-dimensional seismic data structure, two main geological sections with typical structural styles were selected, and the cross-section sand box simulation test was designed. Based on the experimental results, the tectonic evolution sequence was analyzed. The results show that in the steep slope of the adjacent boundary fault in the Nanpu Sag, the structure of the top of the rolling anticline is developed, and the gradient zone of the “DOMINO” type is developed in the slope area far away from the boundary fault. The fault assemblage has the features from slope area to basin The “cabbage” type fault assemblage is the result of the reactivation of early basement fault and has nothing to do with the strike-slip effect. The boundary fault geometry and evolution control the depression structure and then control the development of sedimentary facies Affected the macro distribution of oil and gas laws. The comprehensive analysis shows that the southern slopes are favorable exploration directions, whereas the local structural belts controlled by the early basement faults in the slopes are the most favorable exploration areas.