No sands were encountered at the shallower of the two primary targets of the well alt-hough drilling gases (C1 to C5) and an oil sheen in the drilling mud were observed across the interval. The gases are believed to be indicative of an active petroleum system in the basin and the oil observed in the mud is suspected to have entered the well from one of the prospect bounding faults which may be acting as a conduit for migrating oil.
The deeper objective of the well was encountered on the pre-drill depth prognosis with good development of sandstones in an overall gross interval of more than 400 m. However, no oil or gas shows were observed while drilling through these sediments and subsequent logging confirmed them to be water bearing. The absence of hydrocarbon shows is being investigated. The primary pre-drill risk for this target was effectiveness of the fault bounded trap. Given the evidence of an active petroleum system in the basin, with confirmed source and reservoir outcrops on the basin flanks and well-developed source and reservoir intervals in the well, the lack of shows at this level appears to be prospect specific, with the bounding fault either not sealing or having been breached.
The Snow Leopard-1 well will now be plugged and abandoned and the post well evaluation will commence. Initial examination of cuttings samples and wireline logs indicates the presence of a significant thickness of source rocks in the well, including claystone layers with a 'hot shale' wireline log response. The hot shale response can be an indica-tor of very high organic content (and hence very good source potential) and this will be investigated as the presence of thick, rich source rocks will have a positive impact on de-risking the surrounding prospects in the Taats basin and the adjacent basins.
Once operations are complete at Snow Leopard, the rig will move to the Wild Horse 1 location, a mobilisation distance of some 450 km. The Wild Horse prospect, targeting 480 million bbls of prospective resource, is a large four-way dip and fault bounded closure in the Baatsagaan Basin in Petro Matad's Block IV. The Company has completed all pre-drill formalities for Wild Horse 1, has all the required approvals in hand and has engaged proactively with local stakeholders. A further update will be provided when the well spuds.
Mike Buck, the CEO of Petro Matad said:
"Whilst Snow Leopard 1 did not find the oil accumulations we had hoped for there are encouraging signs in terms of confirmation of source and reservoir rock development. The presence of oil and wet gas shows has heightened our interest in the other prospects mapped in the Taats basin. We are working these up now based on the wealth of information gathered in the well.
Operational attention now shifts to the high impact Wild Horse well which offers huge prospective resource potential and significant follow up in prospects and leads mapped in the Baatsagaan basin."
Read the article online at: https://www.oilfieldtechnology.com/drilling-and-production/20092018/petro-matad-releases-results-from-snow-leopard-1-well/