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Basic Formation Evaluation Of Shale Gas Play April 9, 2012

Posted by ugmsc in Course and Workshop Summary.

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Why shale gas? What’s the big deal? Nowadays, shale gas is the most important energy development since the discovery of oil. The big question is ‘Can shale gas save the world?’.

In southeast asia, there’s a big opportunities in gas market, it’s increasing day by day. In USA, shale gas create over 27% industries for USA and over 25 years will increase. The success beginning of shale gas is in the Barnett Shale in Central Texas. The play’s depth and thickness can vary, but in general it is thicker and deeper in the northeast part of the field, and then thins out and becomes shallower as you move to the south and west.

Shale gas reservoir characteristics are organic shales; both the source of the gas and the reservoir rock; both adsorbed and free gas; not composed primarily of clay minerals; presence of natural fracture; and must be fracture stimulated to produce at economic rates. Shale gas also can’t be evaluated by conventional ways, it must be evaluated by unconventional ways.

Beside that, there are some types of shale gas. They are organic-rich black shale; silt-laminated shale or hybrid; and highly fractured shale. The organic-rich black shale contents with high TOC and high adsorbed gas, the silt laminated shale contents with low TOC, and the highly fractured shale contents with low TOC and low adsorbed gas.

There are many potential spot for Shale Gas play in the world, such as Sweden, Polandia, Vienna Basin, Australia, New Zealand, China, and of course Indonesia. Why develop Shale Gas in Indonesia? Demand for conventional oil and gas is progressively increase; abundance for shale gas resources associated with conventional oil and gas; to meet the high demand of gas both domestically or for foreign currency; available infrastructure for field development; and energy diversification is required, one of them is Shale Gas.

In Shale Gas play, there are 3 aspects. They are geo-chemistry, formation evaluation, and geo-mechanics. Formation and evaluation for shale gas play has it own technology and methodology. Such as triple combo; passey technique; GEM™; wavesonic; seismic petrophysics; etc.

Shale oil is not the same with shale gas. So, when we take the shale gas, it doesn’t influence anything with the oil. All we need is stimulated pressure to evaluate the shale gas. Another difference with shale oil is for shale gas, the distribution passes through the pipe lines. Also in shale gas, there is a little number for permeability, but the most important is brittleness.

So, here is how to define the spot in Shale Gas:

–        The higher index of brittleness and low plasticity means highest fracture complexity and most surface area.

–        Lowest effective closure stress

–        Highest effective porosity

–        Least amount of clay layering per unit volume

–        Most amount of micro-fractures per unit volume

–        Highest TOC-FT when thermally mature



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