The Early Cambrian Mianyang-Changning Intracratonic Sag and Its Control on Petroleum Accumulation in the Sichuan Basin, China

<div>The key seismic profiles indicating presence of Early Cambrian extensional intracratonic sag across the Sichuan basin. (B-B′: NE-striking Weiyuan-Gaoshiti cross-section across the intracratonic sag. The yellow lines show log-data for well picks of the horizon; based on GS-1 and GS-17 wells. Grey arrows show western and eastern sag boundaries. <svg height="12.4698pt" id="M5" style="vertical-align:-3.18147pt" version="1.1" viewbox="-0.0498162 -9.28833 15.9939 12.4698" width="15.9939pt" 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="M513 157H468C452 108 433 76 411 59C390 43 359 35 320 35C215 35 156 134 155 318H424V375H157C166 542 231 631 328 631C405 631 439 598 463 517H510V650C456 666 400 674 341 674C252 674 182 643 132 582C83 521 58 437 58 328C58 104 142 -8 310 -8C377 -8 444 1 513 20V157Z" id="g4-30"></path></g><g transform="matrix(.0091,0,0,-0.0091,7.41,3.132)"><path d="M389 0V32C297 38 291 46 291 118V635C234 613 175 595 109 583V556L161 554C203 552 207 547 207 497V118C207 46 201 38 110 32V0H389Z" id="g50-50"></path></g><g transform="matrix(.013,0,0,-0.013,12.356,0)"><path d="M238 681C243 705 239 712 230 712C217 712 156 682 75 674L70 648H105C148 648 153 641 144 598L39 110C18 11 35 -12 55 -12C90 -12 166 36 221 103L205 125C174 93 130 65 118 65C112 65 108 68 114 96L238 681Z" id="g113-109"></path></g></svg> and <svg height="12.0523pt" id="M6" style="vertical-align:-3.18153pt" version="1.1" viewbox="-0.0498162 -8.87077 17.7816 12.0523" width="17.7816pt" 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="M513 157H468C452 108 433 76 411 59C390 43 359 35 320 35C215 35 156 134 155 318H424V375H157C166 542 231 631 328 631C405 631 439 598 463 517H510V650C456 666 400 674 341 674C252 674 182 643 132 582C83 521 58 437 58 328C58 104 142 -8 310 -8C377 -8 444 1 513 20V157Z" id="g4-30"></path></g><g transform="matrix(.0091,0,0,-0.0091,7.41,3.132)"><path d="M389 0V32C297 38 291 46 291 118V635C234 613 175 595 109 583V556L161 554C203 552 207 547 207 497V118C207 46 201 38 110 32V0H389Z" id="g50-50"></path></g><g transform="matrix(.013,0,0,-0.013,12.356,0)"><path d="M383 397C383 424 344 448 299 448C244 448 172 409 132 375C66 319 23 227 23 146C23 42 74 -12 146 -12C208 -12 298 30 359 103L343 124C315 95 248 48 192 48C145 48 111 85 111 163C111 228 129 294 151 330C171 363 201 401 241 401C275 401 302 384 325 356C332 347 339 344 348 348C373 360 383 381 383 397Z" id="g113-100"></path></g></svg> are bases of Lower Cambrian Longwangmiao and Canglangpu<i> Fm</i>. C-C′: NE-striking Ziyang-Shehong section. All the seismic profiles are rotated back with the Middle Cambrian Gaotai<i> Fm</i>. The inset map shows locations of cross-sections).</div>

Geofluids

fig3

Figure 3

Figure 3: The Early Cambrian Mianyang-Changning Intracratonic Sag and Its Control on Petroleum Accumulation in the Sichuan Basin, China 