车西洼陷西北陡坡沙三下亚段地震相控反演砂砾岩储层预测  

Prediction of sand-conglomerate reservoirs via seismic facies controlled inversion in the Lower Es-3 of the northern steep slope of the Chexi Sag

作　　者：张生[1,2] 黄捍东 王星星[3] 张金伟[1,2] 李金奎 ZHANG Sheng1＇2, HUANG Handong1＇2, WANG Xingxing3, ZHANG Jinwei1＇2, LI Jinkui4(1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum （ Beijing ）, Bei]ing 102249, China 2. Enhanced Oil Recovery Research Institute, China University of Petroleum （Beijing） , Beijing 102249, China 3. Ocean College, Zhejiang University, Hangzhou 310058, China 4. No. 3 Oil Production Plant of PetroChina Huabei Oilfield Company, PetroChina Company Limited, Hejian 062450, China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)提高采收率研究院,北京102249 [3]浙江大学海洋学院,浙江杭州310058 [4]中国石油天然气股份有限公司华北油田分公司第三采油厂,河北河间062450

出　　处：《地学前缘》2018年第2期210-220,共11页Earth Science Frontiers

基　　金：国家自然科学基金项目"中国西部中深层超薄储层地震响应与识别机理"(41674139)

摘　　要：胜利油田的油气勘探方向逐渐由构造油藏向隐蔽油藏转变,砂砾岩油气藏成为非常重要的勘探目标,随着勘探程度的不断提高和新技术的不断应用,断陷湖盆的陡坡带成为重要的关注目标。地震相控反演充分利用了地震相界面对宏观地质体或岩性体的控制作用,将目标地层分成具有不同沉积特征的沉积单元,根据低频背景约束地震道外推反演中每个采样点的初值范围,同时控制反演时窗的大小,使反演结果具有明确的地质意义。针对车西洼陷陡坡带砂砾岩储层成因多、储层相变快、砂体描述困难等问题,在沉积相精细划分、储层物性分析、测井信息约束下,应用地震相控反演,预测古近系沙河街组三段下(沙三下)亚段陡坡带低孔低渗砂砾岩储层"甜点"分布,在扇辫状水道中、远端最有利的优质储层发育相带划分出4个"甜点区"。预测结果表明:砂砾岩体识别在垂向上达砂组级别,局部可达小层级别;横向上,不同成因类型砂体区分明显,可较好地识别出近岸水下扇、滑塌扇等砂砾岩储层,明显提高了断陷盆地陡坡带砂砾岩储层"甜点区"预测精度。As hydrocarbon exploration focus in the Shengli Oilfield gradually shifted from structural reservoir to hidden reservoir, the glutenite reservoirs have become important exploration targets. Increasing in prospecting efforts and application of new technologies also make the steep slope of the faulted lake basin a target of special interest. Seismic facies controlled inversion has the full advantage that the macroscopic geological bodies and lithology are controlled by seismic facies. It divides the target strata into sedimentary units of different sedimentary characteristics; it constrains the initial value range of each sampling point according to the low frequency background, and controls the window size at the same time, so that the inversion results should have definitive geological significance. The glutenite reservoir of the steep slope belt in the Chexi Sag is a multi-genesis deposit with rapid changing lithofacies, making its description difficult. Using seismic facies controlled inversion, where detailed division of sedimentary facies and reservoir physical property analysis were made under the constrains of well log data, the ＂sweet spot＂ distribution of the Paleogene＇s third member of the lower Es-3 steep slope reservoir was predicted. As a result, four ＂sweet spot areas＂ were identified in the middle and distal end of a braided channel, one of the most favorable reservoir facies. Prediction results show that glutenite identification reached the sand group level with some locations up to the level of small layers in the vertical direction. In the lateral direction, different genetic types of sand body could be distinguished clearly, and the nearshore subaqueous fan and slump fan glutenite reservoir were also better identified, which significantly improved the accuracy of sweet spot prediction for the steep slope of the faulted lake basin glutenite reservoir.

关 键 词：甜点预测 砂砾岩储层 断陷湖盆陡坡带 地震相控反演 

分 类 号：P618.13[天文地球—矿床学]