Sinú-San Jacinto- Lower Magdalena Valley


Nowadays, the ANH completed the acquisition of 265 km of 2D seismic with the Sinú-San Jacinto 08 program. After the results obtained in the “Integrated Study of cores and logs obtained in Sinú Basin slim holes“, carried out for ANH by the Universidad de Caldas (2009) new exploratory expectations exist. From this study, some important aspects are highlighted as follows:

The volume of possible reservoir rocks is much more important than that previously assumed.

According to geochemistry, pelitic facies organic matter content of the Arroyo Seco, Tolúviejo, Chengue, The Floral and Ciénaga de Oro formations, are enough to generate important volumes of oil and gas.

Litho and bioestratigraphic results lead to modify the previously postulated evolution models for the Sinú-San Jacinto Basin. From an oceanic fluctuating between deep and shallow environment, to one shallow with deltaic influence and contribution of an igneous metamorphic basement - with continental affinity. The new paleo environmental models for the Cenozoic formations increase the hydrocarbon potential and the exploratory interest in the Sinú-San Jacinto Basin. The Arroyo Seco Formation (type II kerogen, marine) presents the biggest potential for the generation of hydrocarbons. The rest of the Cenozoic sequence is a more gas prone (type III kerogen, humic terrestrial).

Gas flows showed up in the P5, P7, P8-1, P8-2, P11, P10, P13 wells, with presence of liquid hydrocarbons in the P11 well to 246.0 m. Gas flow hindered the perforation and it was causal of abandonment of some wells.

The reached depths were between 20 and 673 m, having an average 353 m for the 18 drilled wells.

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