高桥-杏河地区砂体分布规律及沉积相研究

Study on Sand Body Distribution Rule and the Sedimentary Phase in Gaoqiao-Xinghe Area

鄂尔多斯盆地天然气资源量非常丰富,如已发现的靖边、苏里格等大型气田。近年来的勘探表明,盆地南部的高桥-杏河地区山2-盒8段可能是天然气勘探的重要接替区。在吸收和消化前人的研究成果的基础上,根据区域背景,沉积特征和砂体形态等综合分析,研究沉积相及砂体分布规律。以取芯井建立的单井相模式为依据,利用典型的测井曲线的形态特征、砂岩等厚图,将研究区划分为水下分流河道、水下分流河道间湾、河口坝、前缘席状砂及远砂坝4种微相,进一步利用取芯井和测井资料,对储集层物性与沉积相进行分析,以指导以后的勘探生产。

Ordos Basin has a large scale of gas resource, for example, JinBian gasfield well and Sulige Gasfield. Recent year explanation show the Upper Paleozoic 8th member of Shihezi Fm to 2nd member of Shanxi Fm in Gaoqiao-Xinghe area is a main relay gas exploration area. On the basis of digesting and absorbing the pre-studied results and according to the comprehensive analysis of area background, sedimentary characteristics and sand-body morphological feature, we have studied the sedimentary phase and sand body distribution rule. According to the single well phase mode set by sampling wells and using typical wire-line logging curves, morphological feature, sandstone contour map, the sedimentary phase of research area could be divided into underwater distributary channel, underwater interdistributory bay, mouth bar, front sand sheet and distal bar four micro-phases. The relationship between the reservoir physical properties and sedimentary phase was determined by further applying coring and wire-line logging information, providing the reliable geological basis for ulterior exploration.