【摘要】 毕店地区处于泌阳凹陷中部,属于深水沉积区,含砂率多数在20%。该区核桃园组三段Ⅲ~Ⅵ砂组可识别出湖泊相和湖底扇相,具有较为典型的重力流沉积特征。在取心井段中可寻找到液化流、滑塌、拉裂与掉落岩块的滑动证据;此外,发育砂纹层理、泄水沟构造及渫状构造,后二者见于鲍玛序列C段,它们和砂纹层理伴生,这些岩块的上下层均为鲍玛BE段组合的浊积岩所构成的平整岩层。层拉平的地震剖面也表明核三段Ⅳ砂组中的平行、亚平行地震相之间夹有透镜状或波状、眼球状反射结构,平行、亚平行反射解释为深水背景泥沉积,而波状与眼球状反射为典型的湖底扇。更多还原

【Abstract】 Located in middle Biyang sag, the Bidian area is a deep-water deposition area with sand-bearing ratios being mostly 20%. There exist typical sedimentary gravity flows in the Bidian area, and two kinds of facies, i.e., lacustrine facies and sublacustrine fan facies, were identified in Ⅲ～Ⅳ sand-bed sets of 3rd Member of Hetaoyuan Formation. Sliding evidence of fluidized flows, slips, pull-apart and drop-down rock masses could be found from well cores. In addition, ripple cross laminations, water-escaping structure and dish-shaped structure also grew, with the last two phenomena developed in the Bouma sequence of C segment, in association with the ripple cross laminations. Flat and conformable beds formed by turbidites of Bouma BE segments are seen above and below the rock masses. The layer-flattening seismic profiles also show that, before the deposition of the second sand-bed set of 3rd Member of Hetaoyuan Formation, there existed parallel and sub-parallel seismic reflections interbedded with lentoid or wavy, eyeball-shaped textures. It is held that the parallel and sub-parallel textures probably represent background sediments of deep-water mudstones, whereas the wavy and eyeball-shaped textures represent typical sublacustrine fans.更多还原