轮古7试验区奥陶系潜山构造裂缝特征研究  

Structural Fractures Study on Ordovician Buried Hill in Lungu-7 Pilot Area

作　　者：任康绪[1] 宋新民[1] 赵应成[1] 章寒松[1] 王珏[1] 杜宜静[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《应用基础与工程科学学报》2014年第1期14-26,共13页Journal of Basic Science and Engineering

基　　金：股份重大专项(101012kt3028001b60):特殊复杂岩性油藏上产增储技术研究

摘　　要：基于岩芯定量描述和FMI成像测井资料的系统统计和分析,明确了轮古7试验区奥陶系潜山构造裂缝基本特征.本区构造裂缝以NE-SW走向为主,总体上较发育但非均质性强,裂缝发育区局部集中分布.构造裂缝纵向上主要分布在潜山面以下0—150m范围内,以发育中-高角度缝为主.构造裂缝充填物主要为泥质和方解石,充填缝占60.6%.发育在潜山面附近的裂缝常被泥质半-全充填,而与岩溶作用有关的洞顶缝为未充填或方解石半充填.钻井统计表明本区裂缝型储层所占比重较大,达到44.9%.构造裂缝发育带与中-小型洞穴发育区叠合位置易发育缝洞型储集体,这也是本区今后优选上钻的重要目标,比较合适的井型为水平井或大斜度井.轮古7试验区构造裂缝易沟通下部水体,导致油井快速见水并影响原油采收率,因此开发过程中要及时根据油井生产动态特征采取合理措施控水增油.预测了13个构造裂缝比较发育的区域,优选出5个为缝洞型储层钻探有利区.Based on core quantitative description and FMI imaging logging data analysis, structural fracture characteristics of the Ordovician buried hill in Lungu-7 pilot area were concluded. The direction of structural fractures in the studied area is mainly NE-SW, they are abundantly develop and in an intense heterogeneity. The highly fractured reservoirs are concentrated in local places. In vertical, the structural fractures are mainly distributed below the buried hill surface in a depth range of 0--150m and are predominantly developed in mid-high angles. Most of structural fractures are filled with mud and calcite cement and the quantity of filled fractures ＇accounts for 60. 6%. Fractures which are developed close to the buried hill surface are frequently filled with mud cement partially or totally. Karst cave-roof related fractures are generally unfilled or filled with calcite cement partially. Well data show that the fractured reservoirs developed in a large proportion, reaching 44.9%, in the Lungu-7 pilot area. The places superimposed by fractured zones and middle-small scale cave areas are likely to develop fracture-vuggy reservoirs. They also are important drilling targets in the studied area in the future. The appropriate well types for the reservoir drilling are horizontal or highly-deviated wells. Fractures of the studied area can connect the lower water easily, leading to rapid water breakthrough during production and the oil exploitation capacity reduction. Therefore, reasonable measures should be employed to control water and add oil production according to the well dynamic features. In this paper, 13 fractured zones were predicted and 5 of them were selected to be favorable fracture-vuggy reservoir targets.

关 键 词：构造裂缝 轮古7试验区 潜山 碳酸盐岩 奥陶系 

分 类 号：TE112.2[石油与天然气工程—油气勘探]