临盘油田临13断块区沙二下断块油藏构造特征

临１３断块区内的断层可分为４个级序，其中二级断层多为同生断层，且对沉积的控制作用明显。同时，根据断层的控制特征以及流体分布特征，可将断块区进一步划分为断块组和自然断块。其中，断块组受二级断层的控制，自然断块受三级断层的控制。根据地层产状和上倾方向断层产状的关系，可将自然断块分为同向型、反向型和混合型３类及９个亚类，其中反向型自然断块具有较好的圈闭条件，且该断块油藏具有较高的地质储量，混合型次之，同向型最低。

STRUCTURAL FEATURES OF FAULT BLOCK OIL RESERVOIR OF THE LOWER SHA-2 MEMBER IN LIN-13 BLOCK OF LINPAN OILEIELD

The faults can be divided into four grades in Lin-13 block of Huimin depression. The second-grade fault is mostly contemporaneous fault which controls desposition. The fault block zone may be separated into fault block group and natural fault block according to the characteristics of the fault and the distribution of the stratigraphic fluid. The fault block group is controlled by the second-grade fault, and the natural fault block controlled by the thirdgrade fault. The natural fault block is devided into three types according to the dip relationship between the stratigraphy and the overlying fault of the fault block. The first type has the same dip, named same-dip fault block, and the second one has the opposite dip, named opposite-dip fault block, and the third one has both the same and opposite dips, called "dxed fault block. Among them, the opposite-dip fault block has the best trap conditions and high geological reserves.