Joint sets that enhance production from Middle and Upper Devonian gas shales of the Appalachian Basin

被引:204
作者
Engelder, Terry [1 ]
Lash, Gary G. [2 ]
Uzcategui, Redescal S. [3 ]
机构
[1] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA
[2] SUNY Coll Fredonia, Dept Geosci, Fredonia, NY 14063 USA
[3] Univ Simon Bolivar, Dept Ciencias Tierra, Caracas, Venezuela
关键词
CROSS-FOLD JOINTS; THRUST BELT; LOADING CONFIGURATIONS; SURFACE-MORPHOLOGY; FOSSIL DISTORTION; STRESS VARIATIONS; BLACK SHALE; NEW-YORK; DEFORMATION; PLATEAU;
D O I
10.1306/03230908032
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The marine Middle and Upper Devonian section of the Appalachian Basin includes several black shale units that carry two regional joint sets (J(1) and J(2) sets) as observed in outcrop, core, and borehole images. These joints formed close to or at peak burial depth as natural hydraulic fractures induced by abnormal fluid pressures generated during thermal maturation of organic matter. When present together, earlier J(1) joints are crosscut by later J(2) joints. In outcrops of black shale on the foreland (northwest) side of the Appalachian Basin, the east-northeast-trending J(1) set is more closely spaced than the northwest-striking J(2) set. However, J(2) joints are far more pervasive throughout the exposed Devonian marine clastic section on both sides of the basin. By geological coincidence, the J(1) set is nearly parallel the maximum compressive normal stress of the contemporary tectonic stress field (S-Hmax) Because the contemporary tectonic stress field favors the propagation of hydraulic fracture completions to the east-northeast, fracture stimulation from vertical wells intersects and drains J(2) joints. Horizontal drilling and subsequent stimulation benefit from both joint sets. By drilling in the north-northwest-south-southeast directions, horizontal wells cross and drain J(1) joints, whenever present. Then, staged hydraulic fracture stimulations, if necessary, run east-northeast (i.e., parallel to the J(1) set) under the influence of the contemporary tectonic stress field thereby crosscutting and draining J(2) joints.
引用
收藏
页码:857 / 889
页数:33
相关论文
共 135 条
[1]  
ALVAREZ W, 1978, GEOLOGY, V6, P263, DOI 10.1130/0091-7613(1978)6<263:COSCIP>2.0.CO
[2]  
2
[3]  
Anderson E.M., 1951, The dynamics of faulting and dyke formation with applications to Britain
[4]   DEVELOPMENT OF FAULTS AS ZONES OF DEFORMATION BANDS AND AS SLIP SURFACES IN SANDSTONE [J].
AYDIN, A ;
JOHNSON, AM .
PURE AND APPLIED GEOPHYSICS, 1978, 116 (4-5) :931-942
[5]   SURFACE-MORPHOLOGY ON CROSS-FOLD JOINTS OF THE APPALACHIAN PLATEAU, NEW-YORK AND PENNSYLVANIA [J].
BAHAT, D ;
ENGELDER, T .
TECTONOPHYSICS, 1984, 104 (3-4) :299-313
[6]   Barnett Shale gas production, Fort Worth Basin: Issues and discussion [J].
Bowker, Kent A. .
AAPG BULLETIN, 2007, 91 (04) :523-533
[7]   A NOTE ON BRITTLE CRACK GROWTH IN COMPRESSION [J].
BRACE, WF ;
BOMBOLAKIS, EG .
JOURNAL OF GEOPHYSICAL RESEARCH, 1963, 68 (12) :3709-+
[8]  
BRADLEY WH, 1938, US GEOLOGICAL SURV A, V899, P68
[9]   TRENDS IN RELATIONSHIPS BETWEEN MEASURED INSITU STRESSES AND DEPTH [J].
BROWN, ET ;
HOEK, E .
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 1978, 15 (04) :211-215
[10]  
BROWNING IB, 1935, DEV SHAL S APP GEOL, P16