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FEB-21-1999 17 22 GENERRL CHEMICRI_ - 9 sa. . c. r shown :anon oC -ing pro. year cen- dlor the 1 is rela- rbon di t U[ent tletively mt pea the ar- luippcd o! such dicated hrough nto [he ^. rtcnds w fluid ueous. krably Sown), liquid. ands of :cpara- I liquid !owing an c.,- ~ hilt along lively ..,can oc[ed, thole :srab• duble ydre- such rvern ~f the m the pY*o- LCOY- m as ~ 1 Can bons xilcd per- dieq i. riGry ;. -able car thin rom- ,ub- reat ,~ low ~~ ~~a 3,?59,328 flowing hot aqueous fluid downward along a verti- cally extensive portion of oil shale that contains heat sensitive carbonate mineral, from said vela tivcly 6hallow depth to a deeper depth; outflowing an aqueous solution oC mineral material from a relatively deep depth, in order to cause a horizonal expansion of rubblccontaining cavcm- ou^ zone within said oil (hale; adjwting the rate of Wid fluid inflowf and outflows sa ax to keep a aubctantial proportion of the rubble containing eavem filled with fluid; and recovering shale Oil with said outtlowing flU,d. 2. In a proceu for expanding a lone o(permcabiliry within a subterranean oil shale by forming a cavern within a portion that contains heat xnsitive carbonate mineral and circulating hot aqueou6 fluid within the eavem, the improvement which comptisrs: inflowing hot aqueous fluid into eontatt with a sub- terranean portion of oil shale that contains heat sensitive carbonate mineril at a relatively shallow depth, the temperature of acid inflowing fluid being high enough to pyrolyzc oil shale; flowing hot aqueous Hurd downward tduog a verti- cally extensive portion of 071 shale tfut contains heat sensitive carbonate mineral, from said rela- tively shallow depth to a deeper depth; outflowing an aqueous solution Of mineral material from a relatively deep depth, in order m coati a horizontal expansion of a rubblecontam ing cav- crnoue zone within adid Oil shalt; outflowing a substantially gaseous fluid from the rub- ble-containing eavem at an intcrmcdiatc depth be- tween nc~ depth o(said inflow o(hot aqueous fluid and said outflow of aqueous liquid solution; and recovering shale oil with said outflowing fluid. 3. fn a process for expanding a zone of pcrmeabiliry within a subterranean oil shale by forming a eavem within a portion that tontainf heat sensitive t$rbonale mineral and circulating brat aqueous [laid within the cavern, the improvement which comprises: inflowrng hot aqueous !laid into contact wt[h a cub- terrancan portron of Od 6halc that contams heal sensitive earbnnatc mineral at a relatively shallow depth, [he tempoem re of adid inflnwing Hurd being high enough to pyrolyu oil shale; 3 10 15 xa 25 70 ]S a0 a5 SO SS 60 65 201 515 1985 P.04i08 C, J flowing a mixture of a holaquwus fluid, gauoua car- bon dioxide and hydrocarbon downward along a vertically extensive portion of Oil shale that con- tains heat sensitive eubonate mineral, fmm said relatively shallow depth to a deeper depth; outflowing an aqueous solution of mineral material from a relatively deep depth, in order to cause a horizontal expansion of a rubbletontaining taY- crnous zone within said oi] shale; and recovering shale oil with said oU[ilowing fluid. 4. A process of expanding a fluid permeable opening within a subterranean oil shale formation, comprising: establishing separate pathf of fluid eommunica[ioo between a surface location and upper and lower portions of a relatively solids-free opening within a subterranean oil shale formation that contains heat sensitve carbonate material; mfluwing relatively hot and relatively IOw density aqueous fluid into contact wrth the oil shalt around the upper portion o(said opening at a temperature sulT[cicn[ to cause a localvrd removal of solid ma- lerisl from the oil shilc; remoring cooler and heavtcr fluid from iht lower portion of the opening within uid oil shale fomta- tion at a rate correlated with [hc rate of fluid inflow to maintain a layer of relatively hOl and low density aqueous fluid above a layer oC relatively cooler and higher density aqueous solu[iom of mineral ma[e- nal; and eontutuing uid fluid circulation to cause a generally horizontal expansron of the opening within said oil shalt formation due to a decomposition dissolution of solid rompnnents of the oil shale. 5. The process Of claim a in which uid sub[ertanean oil shale fmrma[iOn contains at Itast about 5 percent by weight of Aca[ sensitive Carbonate material. 6. The process of claim 4 m which: said solids-fret Opening and ai Icast one of said path6 oC fluid communication is extended into an areilly extensive opening within an adjacent underlying zone that is rich in water soluble mineral; and said Hurd circulation is adjusted to cause a generally vertical expansion of said underlying Opening con- current with said generally hurizontal expansion.