物探与化探
物探與化探
물탐여화탐
GEOPHYSICAL AND GEOCHEMICAL EXPLORATION
2015年
1期
60-63,83
,共5页
周印明%刘雪军%张春贺%朱永山
週印明%劉雪軍%張春賀%硃永山
주인명%류설군%장춘하%주영산
时频电磁法%富有机质页岩%“甜点”目标%电阻率%极化率%地震勘探%时频-地震联合反演
時頻電磁法%富有機質頁巖%“甜點”目標%電阻率%極化率%地震勘探%時頻-地震聯閤反縯
시빈전자법%부유궤질혈암%“첨점”목표%전조솔%겁화솔%지진감탐%시빈-지진연합반연
TFEM%organic-rich shale beds%'sweet spot'target%geoelectric property%polarization%Seismic exploration%time frequen-cy seismic joint inversion
通过研究南方碳酸盐岩海相地层发育区岩石标本电磁物性特征,得出页岩层系在地层剖面中为典型的低阻目标,具备利用电磁法勘探的基础,同时,基于岩石样品和井中岩芯的测定结果证实富有机质页岩层系的高极化响应和高TOC含量有很好的对应关系,具备利用极化异常圈定页岩气“甜点”区的有利条件。时频电磁法将时间域电性勘探和频率域极化性勘探结合在一起,通过大功率发射有效激发页岩层系的响应,配合地震勘探等技术,发挥了综合勘探的技术经济优势,实现了快速识别页岩气“甜点”目标的目的。笔者从页岩气目标的物性基础研究入手,总结了针对页岩气目标的电性和极化性异常提取和综合分析技术,为页岩气勘探提高成功率提供了一种快速识别“甜点”目标的新思路和有效手段。
通過研究南方碳痠鹽巖海相地層髮育區巖石標本電磁物性特徵,得齣頁巖層繫在地層剖麵中為典型的低阻目標,具備利用電磁法勘探的基礎,同時,基于巖石樣品和井中巖芯的測定結果證實富有機質頁巖層繫的高極化響應和高TOC含量有很好的對應關繫,具備利用極化異常圈定頁巖氣“甜點”區的有利條件。時頻電磁法將時間域電性勘探和頻率域極化性勘探結閤在一起,通過大功率髮射有效激髮頁巖層繫的響應,配閤地震勘探等技術,髮揮瞭綜閤勘探的技術經濟優勢,實現瞭快速識彆頁巖氣“甜點”目標的目的。筆者從頁巖氣目標的物性基礎研究入手,總結瞭針對頁巖氣目標的電性和極化性異常提取和綜閤分析技術,為頁巖氣勘探提高成功率提供瞭一種快速識彆“甜點”目標的新思路和有效手段。
통과연구남방탄산염암해상지층발육구암석표본전자물성특정,득출혈암층계재지층부면중위전형적저조목표,구비이용전자법감탐적기출,동시,기우암석양품화정중암심적측정결과증실부유궤질혈암층계적고겁화향응화고TOC함량유흔호적대응관계,구비이용겁화이상권정혈암기“첨점”구적유리조건。시빈전자법장시간역전성감탐화빈솔역겁화성감탐결합재일기,통과대공솔발사유효격발혈암층계적향응,배합지진감탐등기술,발휘료종합감탐적기술경제우세,실현료쾌속식별혈암기“첨점”목표적목적。필자종혈암기목표적물성기출연구입수,총결료침대혈암기목표적전성화겁화성이상제취화종합분석기술,위혈암기감탐제고성공솔제공료일충쾌속식별“첨점”목표적신사로화유효수단。
Based on a study of the electromagnetic characteristics of marine carbonate samples collected in southern China, the authors have reached the conclusion that shale beds typically show low resistivity on sections in marine carbonate areas, and this means that the shale beds can be identified with electromagnetic technique. In addition, measurement data of rock samples and core samples show that organic?rich shale beds have high polarization, which is closely related to high TOC, and this implies that we can identify'sweet spot'area of shale gas by using polarization anomaly. TFEM ( Time and Frequency Electromagnetic) combines both time?domain sounding and frequency?domain sounding into a joint system, which induces target shale beds with a high?power transmitter. The method can help seismic technique to quickly identify target'sweet spot'of shale beds. The authors firstly analyze the physical properties of target shale beds, and then demonstrate the method for extracting electric and polarization anomalies aiming at the target beds. The combination of TFEM and seismic method makes the shale beds exploration more economical. This paper introduces this new and effective approach for quick identification of 'sweet spot'and improving the success rate of shale gas exploration.