Seismic
data show that a set of Eocene lacustrine source rocks
exists in the Qiongdongnan (QDN) Basin, northern South China Sea (SCS).
The high content of C30 4-methylsteranes detected in the
crude oil suggests the existence and the effectiveness of the lacustrine
source rocks, and these compounds were not found in the Oligocene
and Miocene source rocks. The above date indicates that the Eocene
source rocks are effective and oil-prone. Lacustrine source rocks
in faulted period have high organic matter abundance and better organic
matter types in the SCS and other typical passive continental margin
basins in the world. Lacustrine source rocks in the Eocene source
rocks (E2w) from the Baiyun Sag of the Pearl River Mouth
Basin have relatively high total organic content (TOC) values, which
can be explained by moderate to high paleoproductivity and anoxic
environment. Therefore, it can be speculated that the Eocene source
rocks have good hydrocarbon potential in the QDN Basin. The developmental
pattern of Eocene source rocks is revealed as follows: In mid-deep
lake environment, high-quality source rocks could be formed, because
of high productivity and better organic matter preservation conditions,
and the central depression belt is the most favored zone beneficial
to Eocene source rock formation, because of the relatively large-scale
mid-deep lake facies. In shore-shallow lake and delta environment,
high-quality source rocks could not be formed, because of the poor
organic matter preservation conditions.
SIS well is a successful technology for coalbed methane development. In this paper, the drilling and completion technology were introduced systematically on the aspects of optimization design of well profile, drilling equipment, drilling and completion technology of vertical well and horizontal well, and intersection technique of these two wells. Two new well patterns, i.e., commingled well and boat-shape well were also proposed. When application this technology to other areas, some improvement may should be made according to special geological data.
The typical characteristic of stoning band coal seams is of multi-layers and low permeability, so fractured vertical well is usually used in the CBM development of this kind of coal seams. As far as the reservoir simulation of vertical fractured CBM wells is concerned, the fracture characterization technique is of great importance. Taking the vertical fractured pilots in F coal measures of Bowen Basin in Australia as an example, this paper will illustrate the application of fracture characterization technique in reservoir simulation. Its highlight is to scientifically characterize the shape of hydraulic fractures and quantitatively describe the reservoir permeability improvement after fracturing through “MULTX” of grid conductivity with Tartan grid model, thereby determining key parameters for the reservoir simulation of fractured vertical wells and providing a scientific basis for establishing CBM development plan and forecasting ultimate recoverable reserves.
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