Influences of Coal Properties on the Principal Permeability Tensor during Primary Coalbed Methane Recovery: A Parametric Study

<div>Normalized curves showing how areal porosity influences principal permeability <svg height="12.4698pt" id="M76" style="vertical-align:-3.18147pt" version="1.1" viewbox="-0.0498162 -9.28833 13.4534 12.4698" width="13.4534pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M480 416C480 431 465 448 438 448C388 448 312 383 252 330C217 299 188 273 155 237H153L257 680C262 700 263 712 253 712C240 712 183 684 97 674L92 648L126 647C166 646 172 645 163 606L23 -6L29 -12C51 -5 77 2 107 8C115 62 130 128 142 180C153 193 179 220 204 241C231 170 259 106 288 54C317 0 336 -12 358 -12C381 -12 423 2 477 80L460 100C434 74 408 54 398 54C385 54 374 65 351 107C326 154 282 241 263 299C296 332 351 377 403 377C424 377 436 372 445 368C449 366 456 368 462 375C472 386 480 402 480 416Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,6.474,3.132)"><path d="M701 633L695 650H264C230 650 223 653 209 675H184C176 622 160 547 140 473L173 471C198 528 219 557 232 573C254 600 272 612 384 612H566L24 18L33 0H597C617 34 651 142 661 179L629 194C598 133 574 92 545 69C510 41 440 40 342 40C274 40 209 42 163 46L701 633Z"></path></g></svg> during primary CBM recovery.</div>

Geofluids

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Figure 4

Figure 4: Influences of Coal Properties on the Principal Permeability Tensor during Primary Coalbed Methane Recovery: A Parametric Study 