荷包场区块须家河组二段、四段储层研究

【作者】 卢正东；

【导师】 蒋裕强； 宋华清；

【作者基本信息】 西南石油大学 ， 地质工程， 2006， 硕士

【摘要】 以地层学、沉积学、储层地质学、测井地质学及地震储层预测等理论和方法为指导，对荷包场区块须二、须四段储层进行了研究：认为须二、须四段沉积相主要为滨浅湖亚环境，微相主要有滩坝／沙坪、粉沙坪、泥坪、坝后沼泽微相及风暴岩，研究区南部须四段和须二段下部见河流沉积。储层岩性主要为岩屑石英砂岩、岩屑长石石英砂岩，少数长石岩屑石英砂岩，为湖盆进退环境中沉积的叠加砂体。须四段主要为低孔、低渗储层，孔隙度主要为5～8％，个别层段大于8％；须二段为中-高孔、低渗-特低渗储层，多数层段孔隙度大于8％；须四段与须二段砂岩渗透率一般均小于1×10^-3μm²，储层非均质性强，为小孔细喉型砂岩，孔隙类型主要为残余原生粒间孔隙和粒内溶蚀孔隙。残余原生粒间孔保留程度是决定储层质量的主要因素，其发育程度的主要控制因素是砂岩岩性，最有利的岩性为中粒、粗粒岩屑质石英砂岩、长石质石英砂岩，其次为碎屑石英自生加大边和铁绿泥石环边胶结发育情况。初步确定须二段有效储层孔隙度下限为8％、须四段为6％，渗透率下限为0.2×10^-3μm²。测井解释表明须二、须四段储层单层厚度普遍较小，累计厚度井间差异大，平面分布呈团块状，连续性较差。须四段的中等～好类储层纵向上主要分布在该段的中、下部，平面上以包45井～包浅001-16井区、包41井～包39井区发育；须二段中等～好类储层纵向上主要分布于该段的中部及中上部，平面上以包24井～包浅001-16井区、包46井～包45井～包浅204井区发育。以现有重新处理的二维地震资料为基础，结合测井解释成果，在对研究区须家河组二段、四段储层地震响应模式认识的基础上，通过伽玛反演和速度反演开展地震储层预测，预测成果反映的须二、须四段储层在横向上的变化趋势与测井解释成果吻合较好。更多还原

【Abstract】 This paper guided by sedimentographics of sedimentology、stratigraphics、 and logging geology as well as seismic reservoir prediction, the reservoir from xujiahe the member 2 and member 4 were studied and accounted that its sub-environment was lacustrine clastic shoreline and its microfacies were beach and bar sands、dust sand、corcass and tempestite and fluviatile deposit/fluvial sediment were found in bottom of xujihe member 2 and south part of xujiah member 4^th. The lithology of reservoir were mainly, fine-grained lithic sandstones and lithic quartz sandstones, which are relatively densedwith a little siltstones that created overlying sandbody in the aggressive and regressive movement of lake basin. The member 4^th were reservoir with low porosity and extremely bad permeability and their porosity was mainly between 5% and 8%, some higher than 8%; the member 2^th are gentle higher bigger porosity and extremely bad permeability, porosity of most of its beds are higher than 8% and there are strong heterogeneity well developed among such two members and their averaged porosities are always smaller than 1×10^-3μm², which defined the reservoirs are one with small pore and thin throat amd the pore forms are remainder intergranular pore, secondary pore, micro-pore and micro-fissure. The quality of reservoirs is how many pores there after the rocks were compressed and how many sand rocks are there in the reservoir and the most preferential factors are coarse quartz sandstone and quartz sandstone with great feldspar and second is how degree the rim cementation of rhipidoith. The low limit of member 2^th and member 4^th are 8% and 6% respectively, the permeability 0.2×10^-3μm² and their single beds are generallt thin and accumulative thickness varied so great based on the logging interpretation, which has distributed horizonal as masses of cords and connectivity are so bad. The good reservoir of xujiahe member 4^th are distributted vertically in the middle and bottom of its bodied, which are represented by zone from bao well 45 to well 001-16 and area from bao 41 to well 39; The good reservoir of xujiahe member 2th are distributed horizontally in the middle and bottom of its bodied, which are represented by zone from bao well 24 to well 001-16 and area from bao 46 to baoqian well 204. Based on reprocessing of 2D sesimic and seismic response modeling, combining with fruits of logging interpretation, through conversion of verged velocity and GR, Tendency of the Biodiversity Variation of xujiahe member 2th and member 4^th gained better dovetail agreement.更多还原