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SUMMARY:The effect of faulting and dolerite intrusions on gas-bearing pote
 ntial of lower Karoo strata
DTSTART;VALUE=DATE-TIME:20140929T120000Z
DTEND;VALUE=DATE-TIME:20140929T122000Z
DTSTAMP;VALUE=DATE-TIME:20261006T151541Z
UID:indico-contribution-4009@events.saip.org.za
DESCRIPTION:Speakers: Peter Booth (Research Associate - NMMU)\nThere are t
 wo phenomena that would have had a detrimental effect on natural gas conta
 ined in strata of the Ecca Group\, in that at least some of the contained 
 gas would have escaped\, or at least been redistributed. These phenomena a
 re (i) deformation features associated with the Cape Fold Belt (CFB) and\,
  (ii) large scale intrusion of dolerites during the Mesozoic. \nDeformatio
 n features of importance include faults\, joints and\, to a lesser extent\
 , cleavages associated with folding during the Cape Orogeny. Normal faults
  are not that common in Karoo strata\, but thrust faults are prevalent. Th
 e latter are ubiquitous in Cape Supergroup strata near the coast. However\
 , recent studies have shown that this type of faulting extends northwards 
 from the coast for some 300 km\, and does affect Karoo strata. A deformati
 on front therefore is defined between Matjiesfontein to Beaufort West\, ex
 tending on to Fort Beaufort\, and then onwards towards East London. \nSeis
 mic surveys conducted by Stankiewiscz and Lindeque in the southern part of
  the Karoo Basin confirm the presence of thrust faults that transect and d
 isplace Cape and Karoo strata\, right up to the frontal zones of deformati
 on near Beaufort West. These surveys show that gas-bearing strata of the W
 hitehill Formation are disrupted\, thus providing escape channelways for r
 edistribution of gas in these and overlying horizons. It remains yet to be
  quantified to what extent these faults have caused redistribution and esc
 ape of gas originally contained in lower Karoo horizons. There is therefor
 e a need for petrophysical studies of fault zones to be conducted\, partic
 ularly in this fontal region of the CFB\, to arrive at some quantification
  of results.\nThe effect of dolerite dykes that have intruded gas bearing 
 strata and effectively driven off gas in lower Karoo rocks would probably 
 not be as great as those of sills and sheets of dolerite (e.g. Thabankulu)
 \, where heat from the  larger igneous bodies would be more widespread. Th
 e latter intrusions would more effectively have driven off the gas from th
 e host rocks (Whitehill Formation). In a best case scenario\, exploration 
 for gasfields north of the escarpment may be favourably pursued\, albeit i
 n smaller segments of the Karoo .\n\nhttps://events.saip.org.za/event/40/c
 ontributions/4009/
LOCATION:Matjiesfontein's Lord Milner Hotel Conference Room\, Matjiesfonte
 in Station
URL:https://events.saip.org.za/event/40/contributions/4009/
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